Database Develop

[Q] Need help to root the new Teclast x98 Air II

Hello!
I just got my new Teclast x98 air ii. Out of the box, Gapps suite is very instable and Google Play doesn't work at all. After reading several forums and tried basic tricks like clearing cache, uninstalling updates, etc... It is still not working. The last thing to try is to install Play store and Play Services in the system/apps space, but obviously I need the tablet to be rooted. Again, after reading a lot on rooting Android devices, I no longer sure if the rooting process is CPU, hardware or OS dependent.
So, is that possible to root this Chinese tablet and if yes, using what tool?

Hi mate ive just received mine . also having the same problems as you. Tried resetting to factory defaults , changed the language from chinese to english . It looked like the play store was going to work . Then it just forced closed . Now wont work at all . Tried doint the ota updtae , but doesnt work . cant find anything on the internet as the tablet is pretty new. If only i could get play store working . hmmm . Its seems a great tablet .Screens spot on and it seems pretty fast .

I signed up to say that other people are also having the Google Play problem, and though I haven't received mine I'm probably going to have that problem, too.
What a bummer. ):

Subscribed. I have one of these on order and found out about the Play Store issue. I am wanting to run Android and not Windows 8.1. Hopefully there is an update soon.
Edit: Just saw this. Anyone with an Air II care to try?
https://twitter.com/srsroot/status/527864446400856066

Yeah I've seen that on twitter . however CPUz claims the tablet is already rooted . I used amazon app store for that . hope we get this sorted soon .

Yes I thought it was already rooted too but I tried running apps that need root and it is not rooted. I verified with Rootchecker and it confirmed...
Now I removed updates on Play Store and Play Services but some apps does not work anymore... like Hangout...

same issue here
Hey guys,
Just gotbmine this morning and have the same issue,
play store browse well but crashes when trying to download
YouTube won't even launch
ota update not working
Plus have regular freezes with the internet browser. Hope we can find a fix soon cause otherwise the tablet is pretty good !

I don't see the point of having an ota app as no one can get it working. Also when my tablet arrived the playstore wasnt fully installed . when I done a factory reset everything installed and had the play store icon on the screen. . still didn't work tho . .. The manufacturer must know the play store has problems , that's why its disabled . its a good tablet ,just wish everything worked as it should .

Ota is working. Downloading now . will let you all know how it goes ..

Still not downloaded . 6 hours later , keeps restarting . grrrr . there's a new guide on a French forum to update the firmware . looks pretty complicated . can't post links yet .

mitchy24 said:
Still not downloaded . 6 hours later , keeps restarting . grrrr . there's a new guide on a French forum to update the firmware . looks pretty complicated . can't post links yet .
Click to expand...
Click to collapse
I managed to download the OTA for 4.4.4, the play store is still not working .

Same here
Thundermeister said:
I managed to download the OTA for 4.4.4, the play store is still not working .
Click to expand...
Click to collapse
Same here. Downloaded and installed the OTA update to 4.4.4 after two attempts.
Downloaded gapps 4.4.4 tried to install it via the teclast update app that is on the tablet. No luck, message said could not verify update.
So I renamed it to update.zip and tried to install via restart and bootloader but no luck.
I suppose I could manually move the files but even then it may not work and that would be tedious.
Oh well, still a good tablet and amazon apps work just fine.
Also 64 GB microSD card won't work but my 16 GB microSD card works just fine.

Tried any other ROMS yet?
Hi All,
I've had the tablet a week now and just updated to 4.4.4 using the Teclast App that was pre-installed. Since the update I've had a few issues with video stuttering and play store and youtube still don't work. So far though I am pretty impressed with the tablet. Still wondering though has anyone tried a different rom on this yet?
-P

Same -- need to know how to root
Having the same problem with the Google play store crashing. It only seems to crash when it attempts to download apps/updates, and the crash logs point to the download manager (i.e., the eng.yankendi.20140922.165954 version of DownloadProvider.apk).
Need root to replace it with some other version -- would that even work or is the download manager a device-specific app?

Beware malware sites
Norton says site is a known malicious site, so not going to bother downloading from there. I have the Air II and been researching the Play Store issue for about a week - no answers yet. None of the simple fixes work, looking at moving the Gapps to a different folder as suggested at one forum - problem is I need root for that, and rooting this thing is just as big of a challenge. There's other sites that claim to have root .bat files but they too install malware on your computer - had it happen to me just today. That's the problem with this sorta thing, the a-holes out there know how desperate people can get to find anything that'll give them root so they plant malware in their "solutions". Anyway I'm gonna keep trying, first have to get root figured out.
*EDIT* Sorry was replying to post #4 and the srsroot link posted there

Play Store fix??
Found this in another thread here at XDA. Anyone brave enough to try it??
http://forum.xda-developers.com/showpost.php?p=56779242&postcount=423
Here's the post:
Google Play Store Fix
Anyone having issues with Google Play Store - this applies to both Air 3G with the latest 2.0.1 update (will post more information later) and Air II - please apply this fix.
Your OS should be rooted in order for this to work.
- Download the files from here.
- Copy the .apk files to a folder on your microSD card.
- Go to Settings > Apps and uninstall Google Play Store.
- Install using the supplied .apk's the following (in this order): Google Play Services, Google Play Store and Link2SD.
- Go to Link2SD, find Google Play Store > Actions > Convert into system app.
- When the conversion is complete, reboot the tablet.
You should find that Google Play store works now, if you still have issues clear ALL it's data and re-enter your account information.
Will post later when the v2.0 (Android 4.4.4) ROM upload is complete with instructions on how to flash it.
I am using it right now and after it was installed it performed an OTA and now I am at v2.0.1_20141105.

I would but... Howto root it?
I haven't found the root procedure the Air ii yet...
How this guy rooted it?

slessard said:
I would but... Howto root it?
I haven't found the root procedure the Air ii yet...
How this guy rooted it?
Click to expand...
Click to collapse
I have this same question. This post has a link to a toolbox for rooting, but I can't get it to work on the Air II. Anyone have any success?
Edit: This one works for rooting. I followed the procedure and Google Play store and apps are now working.

Patent_Litigator said:
I have this same question. This post has a link to a toolbox for rooting, but I can't get it to work on the Air II. Anyone have any success?
Edit: This one works for rooting. I followed the procedure and Google Play store and apps are now working.
Click to expand...
Click to collapse
I rooted with the Chinese version of VRoot (your link) and it seemed to work. I installed a root checking app and it says I have root access. However when I try to convert the PlayStore into system app I got an error from Link2SD telling it doesn't have root access.
Any clue?
thanks
edit: actually it seems vRoot only supports 4.4.2 for now, I made the update to 4.4.4 so it is probably the reason root doesn't work

phatfield said:
Found this in another thread here at XDA. Anyone brave enough to try it??
http://forum.xda-developers.com/showpost.php?p=56779242&postcount=423
Here's the post:
Google Play Store Fix
Anyone having issues with Google Play Store - this applies to both Air 3G with the latest 2.0.1 update (will post more information later) and Air II - please apply this fix.
Your OS should be rooted in order for this to work.
- Download the files from here.
- Copy the .apk files to a folder on your microSD card.
- Go to Settings > Apps and uninstall Google Play Store.
- Install using the supplied .apk's the following (in this order): Google Play Services, Google Play Store and Link2SD.
- Go to Link2SD, find Google Play Store > Actions > Convert into system app.
- When the conversion is complete, reboot the tablet.
You should find that Google Play store works now, if you still have issues clear ALL it's data and re-enter your account information.
Will post later when the v2.0 (Android 4.4.4) ROM upload is complete with instructions on how to flash it.
I am using it right now and after it was installed it performed an OTA and now I am at v2.0.1_20141105.
Click to expand...
Click to collapse
*My tablet: Teclast X98 Air II WiFi*
I wouldn't try using the download provided, only because the download and the instructions given for it don't quite match up. The post says "copy the .apk files" however the download is an *.exe - why would you need to execute a downloaded file to get *.apks? The guy makes it look like it's a zip file - note the .7z in the file name - but that's not its real extension, it's an executable. It's like someone is trying to fool you by making you think the files are zipped up so you'll start the *.exe. I may be wrong but I prefer being too careful rather than sorry later on. Plus the *.apks are easy enough to find - they're all over the Internet.
Having said all that, I still tried the guy's idea but with my own files and I think it works. Well I say "I think" because a) I finally have Play Store working, after days of trying every idea in this thread and what I found Googling, and b) I'm not quite 100% sure of the /exact/ steps I took to finally get Play to work because I was doing so many things at once.
But from memory here are the last few steps I tried before Play miraculously started working (I already had Link2SD installed):
1) Installed latest Play Services *.apk
2) Installed latest Play Store *.apk
3) Opened Link2SD and converted BOTH Play Store & Play Services to system apps (when I was just converting Play Store it never worked)
4) Reboot
The only way I'll ever be sure of exactly what's needed is to wipe my tablet and start over using just these steps, which I just might do since the tablet is so new. However someone else out there may want to give this a try just to see if I'm right about the steps needed. And by the way VRoot worked perfectly for rooting, I used the version for PCs (rooting your tablet from your PC). The supplied SU app for VRoot works fine, I don't read Chinese but all you need to do is check a box and tap a button for every SU request.
Hope this helps, I'll report back with more info as I get the chance.

Google Play Services Has stopped -- i'm becoming crazy

Hi
Samsung galaxy tab 8.9 P7300
I was working with a 4.44 rom and some days ago began popping up of "google play services has stopped".
I tried all procedure find on internet (clear cache/data of google play service, framework, google play...)
I reinstalled the rom 4.44 and tried new rom 7.1 with opengapps (nano/pico) with this sequence:
From twrp
clear data/system/cache/dalvik
Install rom+gapps
clear cache dalvik
reboot
and
SAME PROBLEM!
google play service version
10.2.98 430
help!
EDIT:
My workaround
Rom Android 7.1.1
Opengapps ver. 20170119 version (Google Play service ver. 10.0.84)
After automatic update, "disable" Google Play service and, automatically, restore ver. 10.0.84)
Disable system update on developer menù (waiting Google fix... hope)

Hi derekz2,
I spent the whole day yesterday dealing with the same issue as you do, but so far no luck, until now I have not been able to get it working. I tried Android versions 5.1.1, 6.0, 7.1.1 (different ROMs), but all of them have the same issue with Google Play services. I tried more gapps I found here, not just opengapps, but also some others that were meant to be used with that ROM (according to ROM's authors), but again, nothing helped. I also followed many suggestions I found online, still nothing. Recently I tried not to install gapps from recovery, I tried to download Google Play services from the web (I tried also older version 10.2.97) and install it manually, but the problem is still there. It seems that Google Play services somehow stopped being supported by this hardware, or I do not know... I will continue my troubleshooting further, but at the moment, I am also helpless and I would like to ask anyone for a help as well...
Thanks.

The 10.2.98 updated Play Services package is not woking for KitKat (4.4.x). Remove It and reinstall the last working package - the 10.0.84 for KK. And do uncheck Autoupdate in Play Market, or Android OS will download and install the 10.2.98 again.
Shame on Google for this "work"!

skubko said:
It seems that Google Play services somehow stopped being supported by this hardware, or I do not know... I will continue my troubleshooting further, but at the moment, I am also helpless and I would like to ask anyone for a help as well...
Thanks.
Click to expand...
Click to collapse
I think the same thing but is strange... it seems a decision too bad.
Now I try old version of gapps and without autoupdate the tablet can live but many apps want recent version of GPS...

derekz2 said:
I think the same thing but is strange... it seems a decision too bad.
Now I try old version of gapps and without autoupdate the tablet can live but many apps want recent version of GPS...
Click to expand...
Click to collapse
well, so far it seems that Google has done something in the latest GPS versions that is causing problems not just to us with this tablet, but to many different people on different platforms. Therefore, I believe/hope that Google will fix it soon... Anyway, try to check this thread, people are discussing GPS issue and trying different things to solve it. Let me know if something helps for you, I do not believe I will have time to test it myself today...

Thanks Skubko
The last Opengapps that is ok for 7.1 roms is 20170119 version (gps ver. 10.0.84), disable autoupdate and hope Google fix...

derekz2 said:
Thanks Skubko
The last Opengapps that is ok for 7.1 roms is 20170119 version (gps ver. 10.0.84), disable autoupdate and hope Google fix...
Click to expand...
Click to collapse
yes, I am planning to do that as a next step. For 6.0 ROM anyway, but also version 10.0.84, that should do the trick.. will see if other google application will want to work with older GPS and for how long... Also, I believe that once I connect to the internet afterwards, GPS will be automatically updated to the latest version (I do not think autoupdate option in google play will make any difference for GPS application)...

try to disable system update on developer menu of Android. (I see it on 7.1 version, don't know if present in previous versions)
.

derekz2 said:
try to disable system update on developer menu of Android. (I see it on 7.1 version, don't know if present in previous versions)
Click to expand...
Click to collapse
I can unfortunately report that this does not stop Google Play Services from updating... Will try the method mentioned in thread by skubko and report back in a bit....

codertimt said:
I can unfortunately report that this does not stop Google Play Services from updating... Will try the method mentioned in thread by skubko and report back in a bit....
Click to expand...
Click to collapse
Well, I do have a working tablet again, but unfortunately don't have an exact procedure documented for a fix. I found a couple different threads online where other platforms are having the same issue and it has been tracked down to the latest play services using NEON instructions that are not supported by the older Tegra platform. And, as it's been over a month now, it's not clear if it will be fixed.
The basics of getting things working are to have file manager with root access available to you without wifi. It's possible that exactly what folders need to be created in /data/app/ depends on your Android version. I am working with the latest 7.1.1 build and all instruction I saw to create a folder named com.google.android.gms-1.apk and com.google.android.gms-2.apk did not work. At least not by themselves...on my successful attempt, I created them still, but also created a folder com.google.android.gms-1 as that is where the update came down on my system...so I deleted the existed folder of that name and created an empty one. Again, I don't have an exact procedure...but I will line out some steps that might help someone...
Have working, rooted 7.1.1 install.
Download opengapps from 20170119, phh superuser apk, root file explorer apk.
Factory reset in recovery, install opengapps, wipe cache again for giggles.
Go through setup without setting up wifi, install phh, install root file explorer.
Create folder /data/app/com.google.android.gms-1...maybe the other 2 mentioned above also.
Enable wifi and continue with life. You will have to sideload older versions of some google apps. The latest Google Maps wouldn't work for me...I just searched for the last version before that magic Jan 19th date...that seems to be working fine.
Caveat to this is that this is not exactly what I did to get things working...it is what I think should work. I was actually trying to follow another post that was trying to use a system app remover app to downgrade the google play services...never could get it to work...but stumbled upon something that did work...so I'll lay out those steps...
Have working, rooted 7.1.1 install that has crashing google play services.
Disable wifi
Create the folders mentioned above in /data/app.
Go to Settings->Apps->Google Play Services->Disable. This allowed me to roll back the install of the latest Google play services.
In my case it rolled back to the very previous version..because that is the version I installed from opengapps in recovery...it might roll back to whatever was originally flashed. In that case you can find a 10.0.84 google play services apk...I could never get it to install on mine...but that might have been because I already had a newer version when I was attempting to install.
Enable wifi and possibly sideload some stuff like above...
So, for other Android versions, steps should be similar...perhaps that's when the folders ending in apk will come into play. If there was a reasonably priced >8.5" and <9.5" tablet...preferably with 16:10 aspect ratio and higher pixel density than the Galaxy Tab 8.9 I would buy it...unfortunately such a device doesn't exist. May look into a used Nexus 9...until then it appears I am at least stable again...

Thx guys for your feedback here! Got same problem, that google services stopped working and my tab is crashing nonstop... Its unusable but i think a i will update to android latest rom for next 10 years

What version of play services do I need?
10.0.84 (???

beta version of Google Play Services (version 10.5.42) have resolved the Google Play Services issues.

i have same problem here.... rom is stock based 5.1.1. and working fine, but today it start showing "google play services has stopped" every time when i turn wifi on. :/ this is my daughter "netflix-machine" and she is very sad. is there any fix for that ?

Same here, but solved (with Android N 7.1)
lorvix said:
i have same problem here.... rom is stock based 5.1.1. and working fine, but today it start showing "google play services has stopped" every time when i turn wifi on. :/ this is my daughter "netflix-machine" and she is very sad. is there any fix for that ?
Click to expand...
Click to collapse
How I spent an afternoon
I already tried aosp-5.1.1-p5wifi-20150513 with open_gapps-arm-5.1-pico-20170324 and again with open_gapps-arm-5.1-pico-20170119 as advised here, both resulting in the same bug
Then I installed aosp-6.0-p5wifi-20160131 with open_gapps-arm-6.0-pico-20170324 over TWRP resulting in the same "google play services has stopped" every few seconds
When I fully wiped the device, reinstalled the above aosp image and added open_gapps-arm-6.0-pico-20170119 from github, I had the same *** again
Then I decided to go "all-in" and first installed a new version of TWRP from here and followed the guide to install Android N from here and installed the google apps from here and SU from phh.
And it WORKED
Yay
PS: best use adb push to send the files to the device
PS2: you need to select the keyboard first upon entering the wifi credentials

yes, i get solution for that.....i remove google play service updates and registering to beta user, then it's update beta version 10.5.48 and that's works fine now

Meizu M2 mini freeze and drains battery since latest Google Play Services update

Since latest Google Play Services update (14.7.99) that occured on 4th decembre 2018, my battery lasts only a couple of hours even if I am not using it. All Google Apps don't work anymore including Play Store.
When downgrading to version 14.5.82, everything works again but even if I disable automatic updates in Play Store, Google Play Services keeps updating itself to latest version without asking me any permission.
Is there a way to force block of Google Play Services update until a fix is found ?
Otherwise, does anyone can give me an updated guide for installing TWRP and an alternative ROM ?
I am using Flyme 6.2.0.0G. I have root access with SuperSU installed in system. Root access is confirmed with RootChecker. But I understood that this is not enough. Getting root access doesn't mean bootloader is unlocked, does it ? Is there a way checking bootloader is unlocked before trying to install TWRP ?
Thanks for any response you could give me.

bgillet said:
Since latest Google Play Services update (14.7.99) that occured on 4th decembre 2018, my battery lasts only a couple of hours even if I am not using it. All Google Apps don't work anymore including Play Store.
When downgrading to version 14.5.82, everything works again but even if I disable automatic updates in Play Store, Google Play Services keeps updating itself to latest version without asking me any permission.
Is there a way to force block of Google Play Services update until a fix is found ?
Otherwise, does anyone can give me an updated guide for installing TWRP and an alternative ROM ?
I am using Flyme 6.2.0.0G. I have root access with SuperSU installed in system. Root access is confirmed with RootChecker. But I understood that this is not enough. Getting root access doesn't mean bootloader is unlocked, does it ? Is there a way checking bootloader is unlocked before trying to install TWRP ?
Thanks for any response you could give me.
Click to expand...
Click to collapse
There is a post on forum about unlocking bootloader and my tries on checking it on comments. See if it helps. Dont flash twrp without confirming bootloader unlock. Otherwise your recovery may lose and may cause brick.

adarshm4you said:
There is a post on forum about unlocking bootloader and my tries on checking it on comments. See if it helps. Dont flash twrp without confirming bootloader unlock. Otherwise your recovery may lose and may cause brick.
Click to expand...
Click to collapse
Hi !
Thanks for the answer but which post precisely are you talking about because there are many ? Could you give me a link to it ?
Regards

bgillet said:
Otherwise, does anyone can give me an updated guide for installing TWRP and an alternative ROM ?
Click to expand...
Click to collapse
I started to have this issue on 6/12/18. Google play services used 25% of my battery and I could not use any Google service. (It asked me to sign in again and again.)
I followed this guide (the flash recovery part is mistyped there, I needed fastboot flash recovery filename.xxx to install the new recovery). I downgraded to Flyme 4.5.2 (or whichever version allowed me root by signing in to Flyme), unlocked the recovery and installed AOSP. (CM12 had the same issue with google, Lineage OS didn't boot up.) When I sign in from AOSP, Google emails me that a login was made from a Meizu M6 Note. It thinks my device is safe. It even lets me download Netflix.
I also tried whitelisting my device and allowing less secure apps at Google while on CM, these didn't seem to help.

MEIZU is out of Google certificate.

villenjak said:
MEIZU is out of Google certificate.
Click to expand...
Click to collapse
M2 is out. All new devices released on 2018 are google certified.

About it, custom rom doesn't work. Google Play Service does not work on Lineage Os.

Same here. I've tried to use custom Roms with Android 5.1, 7.1 and it's all the same.
On the other hand, I've got back to Flyme and the issue also occurs, but there's a slight difference. After the Play Store auto updates to v. 12.x.x. then it stops working (error 920 or can't log in). Resolution for this is to delete the Google account in Settings and add it again, yet this works for 5 minutes tops...

Google installer isn't working on the current chinese miui version

just picked up a chinese Mi 9 version. I just found out the hard way that xiaomi no longer supports flashing the global ROM to the chinese version. Bue when I went to install google play, I ran into a hicup. The google installer app errors. it installs the first two frameworks just fine, but it errors on the 3rd. Google Play Services apparently is already installed and at a more recent version.
I manually downloaded a google play apk and got that running ok, but does anyone know what the last apks the installer would be installing are?

StridAst said:
just picked up a chinese Mi 9 version. I just found out the hard way that xiaomi no longer supports flashing the global ROM to the chinese version. Bue when I went to install google play, I ran into a hicup. The google installer app errors. it installs the first two frameworks just fine, but it errors on the 3rd. Google Play Services apparently is already installed and at a more recent version.
I manually downloaded a google play apk and got that running ok, but does anyone know what the last apks the installer would be installing are?
Click to expand...
Click to collapse
Mi9 has google framework preinstalled.
All you need to do is enable it in Settings and install Play Store apk.

StridAst said:
just picked up a chinese Mi 9 version. I just found out the hard way that xiaomi no longer supports flashing the global ROM to the chinese version. Bue when I went to install google play, I ran into a hicup. The google installer app errors. it installs the first two frameworks just fine, but it errors on the 3rd. Google Play Services apparently is already installed and at a more recent version.
I manually downloaded a google play apk and got that running ok, but does anyone know what the last apks the installer would be installing are?
Click to expand...
Click to collapse
I've also just had a problem with this. I bought a new Chinese Mi 10 lite zoom about two weeks ago, spent some time figuring out how to install google play, got it to work, but since it updated a few days ago to the MIUI 12.1.3Stable version, play has since stopped working. I tried the google installer app and have the same problem: it errors on the 3rd and I get a message saying there was a problem parsing the package....
I'm not a developer or really much of a computer guy (but have made it this far!), any help to solve this issue would be appreciated

Few questions for K20 Pro owners

Hi. After a quick search i couldn't find specific answers to my questions so i thought i'll ask here. Note that i'm not interested in flashing any other ROM on it, i want to keep it locked bootloader, on china rom only.
As i have seen on various YT videos, once i get the phone china ROM with locked bootloader, i need to install play store from the xiaomi app store. I see many people get random errors when they try to install, "can't downgrade apps".
1. I've seen workarounds to restore phone to factory settings or clearing something in settings and retrying. Can this just stop working one day?
2. Once i've installed play store, will the device be play store certified?
3. Say i update system software to MIUI 11, can play store just bug out, making me factory reset phone and redo the process again?
4. Will play store auto update itself, or can i update it from play store settings?
5. Will NFC work on china rom locked bootlader in Europe? Moreover, will banking apps allow me to install their apps, considering device may not be play store certified or just not compatible with china rom?
Thank you all for reading.

android2819 said:
Hi. After a quick search i couldn't find specific answers to my questions so i thought i'll ask here. Note that i'm not interested in flashing any other ROM on it, i want to keep it locked bootloader, on china rom only.
As i have seen on various YT videos, once i get the phone china ROM with locked bootloader, i need to install play store from the xiaomi app store. I see many people get random errors when they try to install, "can't downgrade apps".
1. I've seen workarounds to restore phone to factory settings or clearing something in settings and retrying. Can this just stop working one day?
2. Once i've installed play store, will the device be play store certified?
3. Say i update system software to MIUI 11, can play store just bug out, making me factory reset phone and redo the process again?
4. Will play store auto update itself, or can i update it from play store settings?
5. Will NFC work on china rom locked bootlader in Europe? Moreover, will banking apps allow me to install their apps, considering device may not be play store certified or just not compatible with china rom?
Thank you all for reading.
Click to expand...
Click to collapse
if unsure better to ask seller to install playstore for you before purchasing the phone , mine came with playstore preinstall , yes its certified , mpt yet received miui 11 update yet , cant advise , i think mine playstore was self updated , i have not used the nfc feature yet .

1. I've seen workarounds to restore phone to factory settings or clearing something in settings and retrying. Can this just stop working one day?
If you reset your phone, it will also delete playstore and googleplay and services apps.
2. Once i've installed play store, will the device be play store certified?
I hope so, if it isn't certified then you have to register your phone to google (Playstore) for certification. https://www.google.com/android/uncertified/ More here: https://www.xda-developers.com/how-to-fix-device-not-certified-by-google-error/
3. Say i update system software to MIUI 11, can play store just bug out, making me factory reset phone and redo the process again?
Yes, afaik you will have to install Playstore and other googleplay supporting apps again after OS updates.
4. Will play store auto update itself, or can i update it from play store settings?
Yes, it will auto update.
5. Will NFC work ...
Yes.