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Unlocked S8 -> Tmobile

Hello, I'm a tmobile customer that just purchased an unlocked galaxy s8 from the Samsung website. I'm wondering if going to the store and getting the tmobile firmware on it installed is really necessary. I mainly want to do this because of the software updates, but then I thought the the unlocked version might get updates from a different source? Am I right? I'm sorry about this being such a general question, but I just want to do what's best for my new phone. Would you recommend me installing this firmware? Or should I just keep the stock unlocked firmware it came with? Are there any drawbacks associated with not installing the tmobile firmware on it?
EDIT:
To start, will Tmobile even do this in the first place? I'm totally clueless whether they offer installing their software on customer phones or not.
Thank you.

Hi there. Unfortunately, you are going to be really hard pressed to find a T-Mobile rep anywhere that could/would flash firmware w/ Odin. Not saying that there aren't some reps out their that don't know about this stuff (there are a lot that really have no clue though), but this is well outside of what most of them are trained for, plus Odin is only supposed to be used by Samsung. Also, historically (at least the last couple of years), for whatever reason Samsung's unlocked US models have been getting updates slower than the carrier versions, which really doesn't make any sense because there is less to go through to get them updated. That being said, there are several threads in the T-Mobile S8 forum here as well as the general S8 forum dedicated to carrier switching, which can guide you in turning your unlocked model into a T-Mobile model, for all intents and purposes.

oscarm003 said:
Hello, I'm a tmobile customer that just purchased an unlocked galaxy s8 from the Samsung website. I'm wondering if going to the store and getting the tmobile firmware on it installed is really necessary. I mainly want to do this because of the software updates, but then I thought the the unlocked version might get updates from a different source? Am I right? I'm sorry about this being such a general question, but I just want to do what's best for my new phone. Would you recommend me installing this firmware? Or should I just keep the stock unlocked firmware it came with? Are there any drawbacks associated with not installing the tmobile firmware on it?
EDIT:
To start, will Tmobile even do this in the first place? I'm totally clueless whether they offer installing their software on customer phones or not.
Thank you.
Click to expand...
Click to collapse
The guy that replied first is really correct! T-Mobile store won't flash any phone, don't go beyond simple troubleshooting. It is easier to fly to Mars, than talk about flashing a device with rep. I do hope there are some T-Mobile reps that do really know about flashing, but I just haven't seen one yet.
I am with Unlocked S8 and use it on T-Mobile. I don't have any signal specific issues for example and features such as WiFi Calling, Band 12 and VoLTE all work well. There are few thing that flashing to T-Mobile firmware could give you:
Video calling(to specific phones only)
Advanced Messaging(believe other phone needs to support it)
DIGITS service will be built into the phone dialer.
I was also debating about doing it, but all 3 mentioned features are not wildly available and don't work across all devices and networks. On top of that you will get few T-Mobile apps pre-installed + Lookout app + T-Mobile logo when booting up the phone.
We can flash practically anytime we want, so I would suggest you to wait and see how Samsung will treat unlocked devices and how fast updates will arrive. If T-Mobile will do them much better than Samsung, then I will flash myself or when those 3 features above will work across all devices.

Sorry for reviving this thread, but my unlocked s8 gets slower upload and download speeds than my friends tmobile s8, we are both in NYC and he's getting 100mbps and I'm getting 30-40mbps. I assume they also have specific settings hardbaked in their rom that allows for optimized carrier usage?

joey4321 said:
Sorry for reviving this thread, but my unlocked s8 gets slower upload and download speeds than my friends tmobile s8, we are both in NYC and he's getting 100mbps and I'm getting 30-40mbps. I assume they also have specific settings hardbaked in their rom that allows for optimized carrier usage?
Click to expand...
Click to collapse
the t mobile firmware comes with 4x4 MIMO and 256QAM. which leads to better signal and faster download speeds.

Can I flash just the modem or CSC to get the benefits without flashing the whole tmobile rom?

joey4321 said:
Can I flash just the modem or CSC to get the benefits without flashing the whole tmobile rom?
Click to expand...
Click to collapse
This is a question I'd like the answer to. I'd like to keep all the Samsung default software features but get RCS, which is the most important thing, and one of the main reasons I'm still using my LG G6.

raduque said:
This is a question I'd like the answer to. I'd like to keep all the Samsung default software features but get RCS, which is the most important thing, and one of the main reasons I'm still using my LG G6.
Click to expand...
Click to collapse
joey4321 said:
Can I flash just the modem or CSC to get the benefits without flashing the whole tmobile rom?
Click to expand...
Click to collapse
i think you'll need the whole firmware to be able to use RCS and the tmob features. i personally think the tmob firmware is better since it has 4x4 MIMO and 256QAM enabled. so better signal and service

guaneet said:
4x4 MIMO and 256QAM enabled. so better signal and service
Click to expand...
Click to collapse
I don't care about any of that. I value the Samsung unbranded experience more. All I want from the Tmo FW is RCS.
Alternately, if they ever support it using the unlocked S8 FW, i'll switch back to my S8 in a heartbeat. My G6 seems to get tons better battery life anyway for some reason.

Can someone provide a link to a thread for flashing the Unlocked s8 to T-Mobile?
Thanks.

C3cars said:
Can someone provide a link to a thread for flashing the Unlocked s8 to T-Mobile?
Thanks.
Click to expand...
Click to collapse
There are multiple sections, but I believe you need to look under: Flashing Standard Firmware, but do ask, just in case.
https://forum.xda-developers.com/galaxy-s8/how-to/snap-guide-flashing-standard-fw-carrier-t3625817

Charkatak said:
There are multiple sections, but I believe you need to look under: Flashing Standard Firmware, but do ask, just in case.
https://forum.xda-developers.com/galaxy-s8/how-to/snap-guide-flashing-standard-fw-carrier-t3625817
Click to expand...
Click to collapse
I believe you have to use the "flashing unlocked firmware" because the prince's version of the ODIN will bypass the ROM checksum and let you flash any variant you want. if you use the normal ODIN and you are going from unlocked to t-mobile (950U1 to 950U) ROM it will fail.
I used to be on the unlocked but now I'm running t-mobile rom to have multi-line baked in to the native dialer. and my service provider SW ver. shows TMB/TMB/XAA
All is good and I'm happy with the ROM after few days the battery life seems the same as the unlocked version.

i just want to know if i can keep the bloatware free and just flash the modem from tmobile firmware.
i just want wifi calling, volte, 4x4 MIMO and 256QAM. i dont care much for the multi line feature cause not useful on my end and idk about rcs because the person on the other end needs to have it and i dont really see it as useful.
lol s7 bloatware free firmware was so easy to flash compared to this xD
im running the att variant but im sure all the hardware is the same. so i dont see why the unlocked firmware wouldnt support this out of the box.

ImaUseBT said:
i just want to know if i can keep the bloatware free and just flash the modem from tmobile firmware.
i just want wifi calling, volte, 4x4 MIMO and 256QAM. i dont care much for the multi line feature cause not useful on my end and idk about rcs because the person on the other end needs to have it and i dont really see it as useful.
lol s7 bloatware free firmware was so easy to flash compared to this xD
im running the att variant but im sure all the hardware is the same. so i dont see why the unlocked firmware wouldnt support this out of the box.
Click to expand...
Click to collapse
When I had my S7 Edge I was able to mix and match different ROM with different modem files ie I would be on the unlocked ROM with the tmobile modem and was able to use the unlocked firmware with t-mobile radios. This is what you want but I have not tried it with the my S8 you can try if it dont work use the prince's ODIN to take you back to stock.

kdoweb1 said:
When I had my S7 Edge I was able to mix and match different ROM with different modem files ie I would be on the unlocked ROM with the tmobile modem and was able to use the unlocked firmware with t-mobile radios. This is what you want but I have not tried it with the my S8 you can try if it dont work use the prince's ODIN to take you back to stock.
Click to expand...
Click to collapse
yea thats what ive been doing. i just want a blotware free phone but use the tmo features apart from multi line. i just flashed the u1 firmware now so lets see what happens

ImaUseBT said:
yea thats what ive been doing. i just want a blotware free phone but use the tmo features apart from multi line. i just flashed the u1 firmware now so lets see what happens
Click to expand...
Click to collapse
I believe you will have wifi calling and volte but not 4x4 MIMO and 256QAM. i think MIMO is activated in the modem itself.

kdoweb1 said:
I believe you will have wifi calling and volte but not 4x4 MIMO and 256QAM. i think MIMO is activated in the modem itself.
Click to expand...
Click to collapse
hmm i could try to flash the tmobile modem onto this firmware. but yea i do have volte and wifi calling. idk how to check for 4x4 mimo and 256qam

kdoweb1 said:
I believe you have to use the "flashing unlocked firmware" because the prince's version of the ODIN will bypass the ROM checksum and let you flash any variant you want. if you use the normal ODIN and you are going from unlocked to t-mobile (950U1 to 950U) ROM it will fail.
I used to be on the unlocked but now I'm running t-mobile rom to have multi-line baked in to the native dialer. and my service provider SW ver. shows TMB/TMB/XAA
All is good and I'm happy with the ROM after few days the battery life seems the same as the unlocked version.
Click to expand...
Click to collapse
Isn't "flashing unlocked firmware" means that you have a carrier provided phone and want to flash unlocked firmware on it?

Charkatak said:
Isn't "flashing unlocked firmware" means that you have a carrier provided phone and want to flash unlocked firmware on it?
Click to expand...
Click to collapse
Correct, but it also works the other way around. Anytime you want to change variant you must use the modified version of ODIN as it bypass the checksum or the flash will fail.

Thanks Peeps!

[GUIDE] SM-G9600/ SM-G9650 Working on Verizon!

This guide will setup your Qualcomm Galaxy S9/S9+ for use on Verizon Wireless
I have not had any tester for the SM-G9600 but myself and several others have tested and confirmed this to be working on SM-G9650
PLEASE MAKE SURE YOU BACKUP EVERYTHING BEFORE PROCEEDING WITH THIS GUIDE!!!
I am not responsible for any bricks, soft or hard, and not responsible for lost or corrupt imei/efs
Boot into TWRP and select backup.
Tap "Select Storage"
I recommend you backup everything to an extSDCard.
Select Boot, System, Data (if you want), and Carrier Configs
You can backup each one seperately or altogether.
Next select Backup again and select EFS only.
This backup is extremely important!!!!!
keep it stored somewhere online or somewhere safe.
If EFS gets broken and you do not have a backup you will not have a functioning phone. This partition is where your imei is stored.
Now, flash this file S9+_ODM_combo_ATTVZWUSCTMO.zip
Reboot to system and go through Setup Wizard if you have not done so already.
Now boot to TWRP again and flash this file Verizon_EFS_IMEI.zip
Do not flash both at the same time, you will be stuck in a ForceClose loop at Setup Wizard if you have not completed it already.
Now reboot and enjoy Verizon functionality with 2g, 3g, 4g, volte, and wifi-calling!!
If there are any issues let me know and myself and others will do our best to help resolve any issue.
Edit: Updating with a zip that is compatible with pie.
https://www.androidfilehost.com/?fid=1395089523397894553
Wifi calling does not work just yet but we will get it fixed and upload it as soon as we can.
Courtesy of @Krog18 and @stang5litre
Thanks guys!

This also works on T-Mobile using this T-Mobile_EFS_IMEI.zip instead of the Verizon_EFS_IMEI.zip thanks to @klabit87

I dont see the verizon-imei.zip in OP's post. I'd like to give it a try, or if someone could repost it please. Thank you.

sd_N said:
I dont see the verizon-imei.zip in OP's post. I'd like to give it a try, or if someone could repost it please. Thank you.
Click to expand...
Click to collapse
It's there as a hyperlink
https://www.androidfilehost.com/?fid=11410963190603860004
Sent from my Pixel 2 XL using Tapatalk

klabit87 said:
It's there as a hyperlink
https://www.androidfilehost.com/?fid=11410963190603860004
Click to expand...
Click to collapse
Ok, sorry. Didn't see it first time around. Thank you.

Hi! i have an G9600 variant, and i want to flash Pie but there is not an oficial rom for that version. Is there any variant i can install to? like the G965U which has the Snapdragon processor too
thanks

RizziCN said:
Hi! i have an G9600 variant, and i want to flash Pie but there is not an oficial rom for that version. Is there any variant i can install to? like the G965U which has the Snapdragon processor too
thanks
Click to expand...
Click to collapse
Pie will come for our models soon. Just be patient.
Sent from my Pixel 2 XL using Tapatalk

klabit87 said:
Pie will come for our models soon. Just be patient.
Click to expand...
Click to collapse
I was told March by Samsung Care about a half hour ago, sorry this was for 960U1

wilmesg said:
I was told March by Samsung Care about a half hour ago.
Click to expand...
Click to collapse
You were told wrong.
Sent from my Pixel 2 XL using Tapatalk

klabit87 said:
You were told wrong.
Click to expand...
Click to collapse
Just saying what the Samsung Expert stated!

Op updated with pie compatible zip for vzw, tmo, att, usc, and xaa.
Sent from my Pixel 2 XL using Tapatalk

klabit87 said:
Op updated with pie compatible zip for vzw, tmo, att, usc, and xaa.
Sent from my Pixel 2 XL using Tapatalk
Click to expand...
Click to collapse
Would you be able to help get verizon working on the g9750, hong kong s10/s10+?
I have a g955U, a g9750, a verizon sim and a sprint sim. If I can help with anything let me know.
Right now, AFAIK, I only have 4g working, mms only works with 3rd party apps, no carrier aggregation, no 2g or 3g, pretty sure VOLTE works, no wifi calling.

monroe0328 said:
Would you be able to help get verizon working on the g9750, hong kong s10/s10+?
I have a g955U, a g9750, a verizon sim and a sprint sim. If I can help with anything let me know.
Right now, AFAIK, I only have 4g working, mms only works with 3rd party apps, no carrier aggregation, no 2g or 3g, pretty sure VOLTE works, no wifi calling.
Click to expand...
Click to collapse
I only developed the install instructions and tested methods. Krog18 and stang5litre did the work of getting the zips compiled together. But I would suggest opening the zips in this thread and replacing the files in there with s10 files. Of course you'll at least need root.
Sent from my Pixel 2 XL using Tapatalk

Ok cool, I can give it a shot...
Right now it's only speculation that John wu's magisk/root method works on g9750, I suppose I can try it, or just have to wait for confirmed root on my device.

I'm about to purchase an SM-G9650/DS
is there anything I need to look for to get it to work on vzw, as per this guide?

Have any of you guys successfully tried to see if you can get CDMA on the SM-G9750 Galaxy S10 Plus yet?

I tried this on pie with the pie mod and all I can connect to is CDMA 3g no 4g? Any ideas?

SM-G9600
Hi, I have a G9600 that I would like to install a verizon firmware on to but I am new to the scene. I would be happy to test out the firmware but I feel like I am missing a few steps in the process...

recursive_x said:
Hi, I have a G9600 that I would like to install a verizon firmware on to but I am new to the scene. I would be happy to test out the firmware but I feel like I am missing a few steps in the process...
Click to expand...
Click to collapse
No need for Verizon firmware. Just use whatever firmware comes with your device and follow the instructions. Then let me know if you have any issues.
Sent from my Pixel 2 XL using Tapatalk

I'm just running into this after years of hoping for a bootloader unlockable S9 that I can use on Verizon. So much appreciated to Krog18, stang5litre and klabit87 for all your time and help! Quick question, I'm going to try and buy one today, but I see that on Amazon there are two G9650's. One is dual sim and the other is single sim. But they both say that their G9650's. Will this work on either? Because I will definitely go for the dual sim if that's the case. Thank you again!

Crossflash G781B to G781U1 possible?

I'm moving to the US soon and want to use my G781B/DS over there. It looks like the US version supports a lot more bands for both 4G and 5G, so is it possible to convert?
I tried flashing the G781U1 files via Odin but I get a Secure Check Fail: PIT error.
Any help would be greatly appreciated.

fragpic said:
I'm moving to the US soon and want to use my G781B/DS over there. It looks like the US version supports a lot more bands for both 4G and 5G, so is it possible to convert?
I tried flashing the G781U1 files via Odin but I get a Secure Check Fail: PIT error.
Any help would be greatly appreciated.
Click to expand...
Click to collapse
IDK if this will work.
Maybe your device will work fine in the US with its original firmware.
Check this thread:
S20 FE 5g - difference between country versions
Hi, i'm about to buy online an S20FE 5g (preferably an 8GB), and i was wondering about the differences between different versions; i don't know what should i buy to use in Europe. I could not find a comprehensive list, so i thought i could just...
forum.xda-developers.com

Hey @fragpic, did you manage to do the conversion?

[SM-G781B/DS] Remove Unlock Bootloader Warning

Hi,
I am using Samsung S20 FE 5G (SM-G781B / DS) rooted.
I am looking for, how I can remove the warningns when starting the phone ( unlock bootloader warning screen and info about unofficial software ).
I have tried the solution from this page, but it doesn't work on this model.
Do you have any ideas on how to do this?
Remove Unlock Bootloader Warning on Samsung Galaxy S20/S20+/Ultra/FE
In this tutorial, we will show you the steps to remove the unlock bootloader warning screen on Samsung Galaxy S20/S20+/Ultra/FE devices.
www.droidwin.com

The how to is literally in the guide above, you are just flashing an image file to the phone to over write the one with the warning message.

the FE version is for the 4G Exynos

Hi.
I understand, but for the S20FE 5G model (SM-G781B) with Qualcomm Snapdragon 865 processor, this tutorial does not work.
Odin uploaded the file ( via AP ) is Failed.
The FE version is only for the 4G Exynos? And with android 10 or 11?

you might have to manually copy the image file then via root explorer, but you will have to research where etc.

b1k3rdude said:
you might have to manually copy the image file then via root explorer, but you will have to research where etc.
Click to expand...
Click to collapse
that article is basically posting the thread from here we've both posted in by bladez

3mel said:
that article is basically posting the thread from here we've both posted in by bladez
Click to expand...
Click to collapse
Maybe you know where are placed these files for replacement in S20FE 5G ( SM-G781B ) ?

jozek2546 said:
Maybe you know where are placed these files for replacement in S20FE 5G ( SM-G781B ) ?
Click to expand...
Click to collapse
it doesn't work for snapdragon phones

3mel said:
it doesn't work for snapdragon phones
Click to expand...
Click to collapse
And, maybe you know, is still working on android 11 with Samsung SM-G780F ( Exynos ) ?

jozek2546 said:
And, maybe you know, is still working on android 11 with Samsung SM-G780F ( Exynos ) ?
Click to expand...
Click to collapse
no idea

Hello.
Any solution since?
Thanks

Fireyer said:
Hello.
Any solution since?
Thanks
Click to expand...
Click to collapse
not that I've heard of.

Fireyer said:
Hello.
Any solution since?
Thanks
Click to expand...
Click to collapse
actually it has been looked into by a couple of guys recently, the bad news is that control over bootscreens on snap FEs is from the bootloader.
there's no way to modify the bootloader and then to get it signed again, removing the warnings is almost certain to never happen for snap Samsungs.

Question How to Convert Japanese Pixel 7 to Global Version?

i was looking at this guide on how to do it on the pixel 6 and was wondering how to do it on the 7. what about the factory images from google? can i flash this image instead?

after some trial and error using the factory images that google provides, its a bit difficult for me personally with the amount of free time that i have to intensively research this project. so i gained root, enabled volte wifi calling and 5g using this great guide and enabled the camera sounds toggle using this module so i can silence the annoying fake shutter sound. so far so good. i think that there are more things to do like passing the saftynet thing and maybe tinkering in the buildprop.

AJ205 said:
i was looking at this guide on how to do it on the pixel 6 and was wondering how to do it on the 7. what about the factory images from google? can i flash this image instead?
Click to expand...
Click to collapse
Hi, some step right here and I know one guy who change the SKU number only.
Converting Japanese Pixel 6 to Global version
I live in a country with no Pixel availability and end up purchasing one in Japan. Limitations(mostly forced shutter and screenshot sound) on Japan phones can be pretty annoying, so I researched a bit on how to remove those. Search leads me to...
forum.xda-developers.com

I've managed to convert my JP pixel 7 into global version thanks to that post above by following the instructions from HarryShan.

wlteh said:
I've managed to convert my JP pixel 7 into global version thanks to that post above by following the instructions from HarryShan.
Click to expand...
Click to collapse
@wlteh what hexeditor did you used?

renzgy said:
@wlteh what hexeditor did you used?
Click to expand...
Click to collapse
I used Hex Fiend for Mac.

wlteh said:
I used Hex Fiend for Mac.
Click to expand...
Click to collapse
ok thanks. im using windows11.
UPDATE: I Successfully changed the help of @HarryShan instructions and using the app of hex editor in Playstore.

Big thank you for sharing this and to @HarryShan for the simple instructions.
I wanted to contribute in a tiny way since I didn't see it in this thread.
The JP SKU for Pixel 7 is G03Z5
For the other 2 SKU numbers
GQML3
GVU6C
I used the first one since it is listed to have support for both 5G networks. Source: https://www.xda-developers.com/google-pixel-7-5g-support/

Pannka said:
Big thank you for sharing this and to @HarryShan for the simple instructions.
I wanted to contribute in a tiny way since I didn't see it in this thread.
The JP SKU for Pixel 7 is G03Z5
For the other 2 SKU numbers
GQML3
GVU6C
I used the first one since it is listed to have support for both 5G networks. Source: https://www.xda-developers.com/google-pixel-7-5g-support/
Click to expand...
Click to collapse
I think the GQML3 version is only for Verizon units, which is considered locked. I'm not sure if that will affect your connectivity in any way if you're not on Verizon. The GVU6C is the unlocked version which is meant for global use on any carriers.

Thank you @wlteh for the info. I haven't actually inserted my SIM yet to test so I will change to the GVU6C version beforehand.
Also if anyone plans on unrooting the phone, don't forget to flash the stock image first. I got a "No operating system could be found" message after I bootlocked my phone. Luckliy "volume down + power button" combo got me back into fastboot so I could unlock the bootloader again.

Hi Guys
I've managed to convert my JP pixel 7 into global version but the thing is most of voice calls are working only 3g mode when i switch it to 4G or 5G voice calls are not works for me. When someone trying to call to my phone its says my mobile phone is swithed off. any idea to fix this?