relock bootloader - OnePlus 3T Questions & Answers

I am thinking of going back to stock as I see no need for root at the moment. Can I lock the bootloader again and unlock it again in the future?

use this : https://forum.xda-developers.com/oneplus-3t/development/toolkit-oneplus-3t-toolkit-unlock-t3507729

Erik1805 said:
I am thinking of going back to stock as I see no need for root at the moment. Can I lock the bootloader again and unlock it again in the future?
Click to expand...
Click to collapse
Yes you can. Just remember that it'll wipe your device.
andivivaldi said:
use this : https://forum.xda-developers.com/oneplus-3t/development/toolkit-oneplus-3t-toolkit-unlock-t3507729
Click to expand...
Click to collapse
If you're gonna use toolkits, at least use the right one... That link is for the outdated version. I'm sure it works, but still...
https://forum.xda-developers.com/oneplus-3/development/toolkit-oneplus-3-toolkit-unlock-t3398799
And I'm gonna add the obligatory remark on how learning to use fastboot and adb can be very useful when tinkering with your device. It can sometimes save your device when toolkits can't and you'll learn a lot about how your device works. :good:

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Unlocking will change no data on your phone. Fastboot oem unlock and go
Ignore the above, unlocking will wipe your phone.
Take a backup via recovery, unlock, then restore it.
..................
Rusty! said:
Ignore the above, unlocking will wipe your phone.
Take a backup via recovery, unlock, then restore it.
Click to expand...
Click to collapse
My bad, for some reason I never remembered it wiping my phone. Apologies.
Hollow.Droid said:
My bad, for some reason I never remembered it wiping my phone. Apologies.
Click to expand...
Click to collapse
That's fine, your intention was to help me .
Did it erase your custom recovery?
I'm wondering if I will have to install ClockworkMod again.
Will leave recovery alone, it's /data that goes when the phone is wiped.
Rusty! said:
Will leave recovery alone, it's /data that goes when the phone is wiped.
Click to expand...
Click to collapse
Thank you very much.
I dont mean to hijack a thread at the same time I don't want to start a new one on a simple question.
What is the benifit of an unlocked bootloader over just being rooted? With Gb on the horizon and every new update taking away easy root methods I've been debating on just unlocking and not worrying about it. Are there any other advantages?
wrench115 said:
I dont mean to hijack a thread at the same time I don't want to start a new one on a simple question.
What is the benifit of an unlocked bootloader over just being rooted? With Gb on the horizon and every new update taking away easy root methods I've been debating on just unlocking and not worrying about it. Are there any other advantages?
Click to expand...
Click to collapse
That's one advantage, another is that it lets you use fastboot for flashing radios etc. You don't risk bricking your phone that way.
I have a locked bootloader, I just use flash_image to flash the radios or whatever. Works just like fastboot.
futango said:
I have a locked bootloader, I just use flash_image to flash the radios or whatever. Works just like fastboot.
Click to expand...
Click to collapse
No, not "just like fastboot". If I'm not mistaken, flash_image doesn't check the signatures of the files being flashed, thus corrupt radios can be flashed using it, but they can't be flashed using fastboot - it'll safely revert the flash.

How to enable Developer Settings

Courtesy of Android Central, thanks for the heads up!
This is essential to get an unlocked bootloader.
https://www.youtube.com/watch?v=mp07dPusJNA&feature=youtube_gdata_player
How come they have done that?
hahaha that was awesome!
This reminds me of the taps @ Andrioid Version to get the Zombie art
Jordanooo said:
How come they have done that?
Click to expand...
Click to collapse
Because they are trying to make it a consumer phone as well as a developers phone. The average user doesn't need these settings, and could very easily mess up their phone by using them. With such an easy method to re enable them, why not do it?
jak3z said:
This reminds me of the taps @ Andrioid Version to get the Zombie art
Click to expand...
Click to collapse
And the BumbleBee in HC, the NyanDroid in ICS, and the Jellybean in JB
Tapatalk² from my Optimus V
LOL at the "now you are 3...2...1 steps to becoming a developer" xD
Google has some humor
lol at least it keeps those who don't know what they are doing from messing up their phone
mjybarr said:
This is essential to get an unlocked bootloader.
Click to expand...
Click to collapse
Sure good to know, but what does it have to do with the bootloader? I thought that to unlock bootloader, you only need to "fastboot oem unlock"?
It's unlikely that I need to change an option in the menu in order to unlock... What if I somehow screw up and can't boot, and then lock to bootloader? Stuck with a brick?
My Gnexi said:
Sure good to know, but what does it have to do with the bootloader? I thought that to unlock bootloader, you only need to "fastboot oem unlock"?
It's unlikely that I need to change an option in the menu in order to unlock... What if I somehow screw up and can't boot, and then lock to bootloader? Stuck with a brick?
Click to expand...
Click to collapse
You need to get into developer settings and activate USB debugging so you can use adb to proceed to unlock the bootloader.
Also I find the way to unlock developer settings to be quite humorous! Sadly I can see many impatient users looking to access said settings the first time be be put off by this, hopefully they will see reason!
Awwwwsome
Sent from my GT-N7100 using Tapatalk 2
mjybarr said:
Courtesy of Android Central, thanks for the heads up!
This is essential to get an unlocked bootloader.
https://www.youtube.com/watch?v=mp07dPusJNA&feature=youtube_gdata_player
Click to expand...
Click to collapse
That, my friend ,is Awesome!
The Unnamed Time Lord said:
You need to get into developer settings and activate USB debugging so you can use adb to proceed to unlock the bootloader.
Click to expand...
Click to collapse
You don't need adb to unlock the bootloader! Unlocking is done in fastboot mode, so saying "This is essential to get an unlocked bootloader" is wrong.
You can get to the bootloader (fastboot mode) by pressing the buttons during boot.
My Gnexi said:
You don't need adb to unlock the bootloader! Unlocking is done in fastboot mode, so saying "This is essential to get an unlocked bootloader" is wrong.
You can get to the bootloader (fastboot mode) by pressing the buttons during boot.
Click to expand...
Click to collapse
Your wrong my friend.
http://forum.xda-developers.com/showthread.php?t=1972508
Read step 5 in the link above ^^
Sent from my HTC VLE_U using Tapatalk 2
The guide is wrong.
Never mind.
Hello,
mjybarr said:
Your wrong my friend.
http://forum.xda-developers.com/showthread.php?t=1972508
Read step 5 in the link above ^^
Click to expand...
Click to collapse
Please read this reply by efrant:
http://forum.xda-developers.com/showpost.php?p=33727130&postcount=27
efrant said:
This is not just directed at the OP:
I think people should wait until they get a hold of the device before posting guides and directing others on what to do. Unless you actually try something and it works, I wouldn't be posting any guides.
Just to clarify some mis-information in this thread:
1) You do not need to install the SDK (and you do not need it to install the driver) -- the SDK is just a bunch of stuff that, unless you are developing, you will never need;
2) The driver for the N4 may not even be included in the SDK -- the GNex driver certainly wasn't;
3) For the fastboot driver to install (and for fastboot commands to work), your device must be booted in fastboot mode;
4) USB Debugging is a feature of Android, and to use it, you have to be booted into Android -- it has nothing to do with the bootloader;
5) Currently, there is no exploit to gain root on any build of Android higher than 4.1.1, so, there is no way to gain root without unlocking the bootloader at this time.
Click to expand...
Click to collapse
Also, 2 responders above in the same page say that.
Also, it doesn't make sense to me that fastboot's operation will check an option that is selected while you are in the OS.
If someone that has the device can check it then great, until then I'll assume USB Debugging is NOT needed to unlock bootloader.

DO you guys want me to make a youtube video on how to unlock bootloader and root?

the title says it all
yes please. I got the bootloader unlocked but i cant get root and its stressing me out haha
I'm sure it will be useful to many people. I say do it.
kafepuya said:
I'm sure it will be useful to many people. I say do it.
Click to expand...
Click to collapse
and relocking bootloader too.
AFIAK you can't re-lock but if you can I'm down. As for the how to... follow simple written directions in the other thread and done.
scottyd035ntknow said:
AFIAK you can't re-lock but if you can I'm down. As for the how to... follow simple written directions in the other thread and done.
Click to expand...
Click to collapse
yes you can. i did it and so this guy. after i saw i tried it and unlocked mine
http://forum.xda-developers.com/showpost.php?p=68059274&postcount=215
you can relock bootloader but i think it will cause an issue if you on stock rom with mods
mymeatb18 said:
you can relock bootloader but i think it will cause an issue if you on stock rom with mods
Click to expand...
Click to collapse
it will wipe all data ..
Yes to doing a video. Even though I'm pretty good at following written instructions I always feel a bit more confident by watching a video before hand just so I can have a visual of what to expect.
bootloader oem
locking or unlocking will wipe your data and you can find out the current status of the bootloader using this command:
fastboot getvar all
this will list some system info including the locked or unlocked status of the bootloader so you can verify it
Yeah I'm all for re-locking mine as long as it'll maintain root and not mess with xposed framework.... if it does I suppose I'll just leave it.
scottyd035ntknow said:
Yeah I'm all for re-locking mine as long as it'll maintain root and not mess with xposed framework.... if it does I suppose I'll just leave it.
Click to expand...
Click to collapse
no you wont if you want root. on MM then you must unlock. if you want root with locked bootloader then use LP.
Well its already rooted and its performing WAY too good on the rooted stock rom with ad blockers and bloat disabled for me to want to screw with. I suppose I'll just leave it alone for now. I dunno if my phone is a freak or its just MM or they are all like that but besides being blazing fast it gets reception EVERYWHERE. My wife even goes wtf when we go into places where I maintain decent LTE and she is on edge and I have to turn on tethering lol.

Should I do OEM Lock after flashed stock+unroot?

Hi,
Few hours ago I used Nexus toolkit to return to stock rom + unrooting.
I think everything went smoothly bc's it booted succsesfuly into the fist stage of the set the language of the device.
I heard that people bricked thier devices after OTA updating - That b'cs something with the Bootloader...("Somthing" is bc's I dont know if it happened due to leaved it Unlocked or proceed the
"Relock Bootloader"(OEM Lock).
So, What should I do?
Leave unlocked OR excute "Relock Bootloader"(OEM Lock)
???
Thank you!
I've seen many comments in these forums from experienced members saying that unless you're really paranoid about security you should leave it unlocked so that you have at least the possibility to recover from bricking.
Thanks for the quick replay @dahawthorne
So...you think it someting that happened to some particularly users and NOT a comprehensively issue that happaned to many android users that unlocked the device before?
P.S: am using the Nexus Toolkit by WugFresh.
For relock the BL - Just push on "OEM Lock", right?
Thank you!!
shabydog said:
...
So, What should I do?!
Click to expand...
Click to collapse
Read the post #2 again. Search XDA for 'unlock bootloader'.
Wonder why so many XDA members will keep root access and unlocked bootloader.
shabydog said:
P.S: am using the Nexus Toolkit by WugFresh.
For relock the BL - Just push on "OEM Lock", right?
Click to expand...
Click to collapse
You do understand that I'm recommending leaving your device *unlocked*, right...?
@shabydog: For heaven's sake man, don't lock your bootloader as it's a lot easier to recover the device if the bootloader is unlocked. Google has made it easier to recover a bricked device by offering the full system in an OTA package, but despite that, you still shouldn't lock the bootloader.
@dahawthorne @Strephon Alkhalikoi @NLBeev
Conclusion: I must leave the bootloader LOCKED.
And as long I did not touched the "OEM Lock" under Relock bootloader ==> i'm safe, right?
Thank you all so much.
shabydog said:
@[email protected] [email protected]
Conclusion: I must leave the bootloader LOCKED.
Click to expand...
Click to collapse
Obviously I need to brush up on my communications skills.
YOU MUST LEAVE THE BOOTLOADER ***UNLOCKED***.
dahawthorne said:
.../ brush up on my communications skills.....
Click to expand...
Click to collapse
More power of a transmitter does not mean the receiver is fine tuned.
I love first world problems. So after another thread to ask about flashing a Nexus back to stock, he has to open a separate thread for locking the bootloader.
@shabydog If it gives you this much stress, don't do anything. You have it, as I understand, back to stock, it's working, just put it back in its box, and sell it, or keep it, I don't care, but you should really not touch it.
Sorryyyy...I messed up with all the info' and so on.
YOU MUST LEAVE THE BOOTLOADER ***UNLOCKED***.
Click to expand...
Click to collapse
So Yes - I did not touched at all with "OEM Lock" under Relock.
Sory, it's just "T-M-I" for me - and not only here - with any "unkown" instructions./tut's.
Just confusing with learmimg something that I dont know.
But I just love it so much!!!!!!!!
I know you'r familiar with - deeply into that.
I want to learn...sometimes it's hard for me so it takes time.
Hope you can understand

How To find Vivo Bootloader Unlock/Lock Command Line?

Please Master help me. I want to root my phone but first, i have to unlock bootloader from this phone (Vivo V20). I already use Command Line " fastboot flashing unlock ", " fastboot oem unlock ", " fastboot bbk unlock_vivo ", "fastboot bbk vivo_bsp unlock_vivo". Nothing Works...
Maybe someone here know how to see command line to unlock bootloader manually from system file, please help.
1. You need to Enable developer mode on your phone
2. You need to enable USB Debugging inside of developer options
3. Also, enable OEM Unlock inside developer options also ( If you dont see this option, good luck with rooting.. )
You will also need to set up ADB platform tools sdk on your computer if you are going to root
SDK Tools Setup - https://www.xda-developers.com/install-adb-windows-macos-linux/
Unlock Bootloader - https://www.lifewire.com/how-to-unlock-bootloader-android-phone-4689186
Be carefull please Dont brick your device... make sure to do your research and verify that your specific phone can be rooted...
Nameless Foe said:
1. You need to Enable developer mode on your phone
2. You need to enable USB Debugging inside of developer options
3. Also, enable OEM Unlock inside developer options also ( If you dont see this option, good luck with rooting.. )
You will also need to set up ADB platform tools sdk on your computer if you are going to root
SDK Tools Setup - https://www.xda-developers.com/install-adb-windows-macos-linux/
Unlock Bootloader - https://www.lifewire.com/how-to-unlock-bootloader-android-phone-4689186
Be carefull please Dont brick your device... make sure to do your research and verify that your specific phone can be rooted...
Click to expand...
Click to collapse
Not Work for for Vivo V20
Kwachi said:
Not Work for for Vivo V20
Click to expand...
Click to collapse
Of you don't see the option to toggle the OEM bootloader unlock inside of developer settings, I doubt you will be able to root
Don't feel bad. I can't root either
Nameless Foe said:
Of you don't see the option to toggle the OEM bootloader unlock inside of developer settings, I doubt you will be able to root
Don't feel bad. I can't root either
Click to expand...
Click to collapse
Toggle OEM already on but still cannot unlock bootloader
Vivo doesn't allow their devices' bootloader getting unlocked, so you can't unlock (most of) them.
On their support page, they stated "BL cannot be unlocked" (which is false), and "suggest you not to try it".
If you really want to unlock your bootloader, nah you can't, the only way might be selling your Vivo for something else (OnePlus, Xiaomi, etc.) that allows bootloader unlocking.
Edit 1: For some older Vivo (and Oppo), you might be able to use EDL to flash a custom recovery. OR for even older ones, you can actually unlock.
Edit 2: I believe most Vivo (including Oppo) doesn't even have the normal aboot bootloader mode.
TipzTeam said:
Vivo doesn't allow their devices' bootloader getting unlocked, so you can't unlock it.
On their support page, they stated "BL cannot be unlocked" (which is false), and "suggest you not to try it".
If you really want to unlock your bootloader, nah you can't, the only way might be selling your Vivo for something else (OnePlus, Xiaomi, etc.) that allows bootloader unlocking.
Click to expand...
Click to collapse
Can those 3 varieties of phones you listed be rooted even if its a US Version phone?
Nameless Foe said:
Can those 3 varieties of phones you listed be rooted even if its a US Version phone?
Click to expand...
Click to collapse
Those are OEMs that allow bootloader unlocking.
TipzTeam said:
Those are OEMs that allow bootloader unlocking.
Click to expand...
Click to collapse
Ohh. Ok. Cool. I'm gonna buy one. I have the Galaxy A71 and I can't do nothing
Nameless Foe said:
Ohh. Ok. Cool. I'm gonna buy one. I have the Galaxy A71 and I can't do nothing
Click to expand...
Click to collapse
A Samsung Galaxy A71 should be able to be "unlocked", but using Samsung's custom aboot download mode.
TipzTeam said:
A Samsung Galaxy A71 should be able to be "unlocked", but using Samsung's custom aboot download mode.
Click to expand...
Click to collapse
How do I go about that ? You have my attention
Nameless Foe said:
How do I go about that ? You have my attention
Click to expand...
Click to collapse
You can find your solution here: https://forum.xda-developers.com/f/samsung-galaxy-a71-roms-kernels-recoveries-ot.9845/
TipzTeam said:
You can find your solution here: https://forum.xda-developers.com/f/samsung-galaxy-a71-roms-kernels-recoveries-ot.9845/
Click to expand...
Click to collapse
Noo. Not quite. I can't unlocknmy bootloader. My dev options does not have this inside of it anywhere
Nameless Foe said:
Noo. Not quite. I can't unlocknmy bootloader. My dev options does not have this inside of it anywhere
Click to expand...
Click to collapse
You can't unlock it, you have to use Samsung's download mode to flash a custom recovery directly.
TipzTeam said:
You can't unlock it, you have to use Samsung's download mode to flash a custom recovery directly.
Click to expand...
Click to collapse
Hey. Can you dm me please. I think I know what your saying but I would really appreciate the help if you don't mind
Nameless Foe said:
Hey. Can you dm me please. I think I know what your saying but I would really appreciate the help if you don't mind
Click to expand...
Click to collapse
nah, just check this out: https://forum.xda-developers.com/t/recovery-a715f-twrp-3-5-0-ianmacd.4221253
TipzTeam said:
nah, just check this out: https://forum.xda-developers.com/t/recovery-a715f-twrp-3-5-0-ianmacd.4221253
Click to expand...
Click to collapse
Fine fine. Thanks
Nameless Foe said:
Fine fine. Thanks
Click to expand...
Click to collapse
TipzTeam said:
nah, just check this out: https://forum.xda-developers.com/t/recovery-a715f-twrp-3-5-0-ianmacd.4221253
Click to expand...
Click to collapse
Ok so just so we are on the same page, one of the instructions is to unlock oem inside developer settings on this post you sent me to.. i do NOT have that option.. just to be clear
Nameless Foe said:
Ok so just so we are on the same page, one of the instructions is to unlock oem inside developer settings on this post you sent me to.. i do NOT have that option.. just to be clear
Click to expand...
Click to collapse
Try skipping it?
TipzTeam said:
Try skipping it?
Click to expand...
Click to collapse
yea i tried to skip did not work unfortunatly

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