[GUIDE] Complete Step-by-Step Convert T-Mobile to Global (or other) firmware

[thattechguy_69]

*** Use this at your very own risk.
*** You will lose all data
*** Backup your working modem and persist, just in case.
*** USE USB 2.0 Port and Windows Machine

!!! BEFORE YOU CONTINUE, POST #3 CONTAINS AN IMPORTANT MESSAGE SPECIFICALLY FOR THIS THREAD !!!​

Spoiler: Requirements = Install these prerequisites before proceeding

- 32-bit | 64-bit Qualcomm Driver
- OnePlus Drivers
- Google USB Driver

Part 1: Return to T-Mobile Stock Firmware via MSM TOOL​

Turn on Test Mode, Disable Device Driver Signing via Powershell and set Time Date to 2017, then restart PC

bcdedit.exe /set nointegritychecks off
bcdedit.exe /set testsigning off

1. Launch MsmDownloadTool V4.0.exe.
2. On the login prompt select "Other" in the dropdown menu and click on Next.
3. Click on Target button and select TMO.
4. Press Start button so that it waits for your device to be connected
5. Power off your device
6. Put your phone in EDL mode

• by completely turning off your device, hold vol up + vol down and plug in the cable

OR

• via ADB command

adb reboot edl

7. Once phone is in EDL Mode, immediately Click ENUM button and then START button

Wait approximately ~250-300 seconds.
Device will reboot afterwards.

Part 2: Unlock Bootloader with no code and apply Dual SIM​

After reboot, Turn on OEM Unlock in Developer Options before proceeding with the steps

1. Rename and move “instantnoodlet_15_O.16_201001.ops” from MSM Tool directory to somewhere else (e.g., Documents Folder)
2. Download "unlock.ops" and rename it to instantnoodlet_15_O.16_201001.ops
3. Move the "renamed unlock.ops" to MSM Tool directory
4. Launch MSM Tool and proceed using the steps from Part 1


MSM Tool will finish flashing in under 15 seconds and the device will reboot with the message, "<!> The device is corrupt.."


5. Unplug phone from PC and Force Shutdown device by simultaneously press and holding Power and Vol buttons till the device reboots
6. Let go of all buttons once you see device reboot with the logo FASTBOOT MODE, the big START logo will appear afterwards
7. Open SDK Platform Tools folder and launch Powershell/CMD from there
8. Copy and paste this command to check if device is recognized in FASTBOOT

fastboot devices

9. Once device isrecognized by terminal, copy and paste this other command

fastboot flashing unlock

10. A confirm bootloader prompt will appear, use Vol buttons to hover on UNLOCK THE BOOTLOADER and to confirm, simply press Power button

Once confirmed, device will reboot back to T-Mobile Firmware but now with Dual SIM and an unlocked bootloader. To use the MSM Tool again without the "unlock.ops", move the unlock.ops to a different place and put back the original ops.

Part 3: Converting to other regions (e.g., Global, EU, Indian) and lock Bootloader​

*** Cannot lock bootloader after flashing Fastboot ROM. Will corrupt device ​

*** As of right now, Dual SIM doesn't work on OOS12/13 Indian Firmware​

1. Download this Fastboot ROM
2. Open Fastboot ROM Folder, click flash-all.bat and type and enter "y" to the terminal

Do you want to wipe all the data ( Reccomended )[Y/N]?y
< waiting for any device >

3. Reboot phone to FASTBOOT MODE and plug the phone back to the PC
4. Once the process is done, find an OTA ZIP from this thread to update to and download it

(You can use ota.zips from any region whether it be EU/India/Global, e.g., OxygenOS 11 Global 11.0.11.11)

5. put the OTA ZIP in the phone, update it and reboot

After rebooting, you can either lock bootloader or stay unlocked to root

6. To lock bootloader, reboot to FASTBOOT and plug phone in to PC
7. Open platforms-tool and open a terminal from the folder
8. Copy, paste and enter this command:

fastboot flashing lock

9. Confirm the prompt LOCK THE BOOTLOADER and the phone will perform a factory reset and reboot.

There you go! What you can do at this point is stay and daily drive OxygenOS 11 or update to OxygenOS 12/13 or even ColorOS. Dual SIM will work on any Firmware Region. The phone's model will also permanently change to IN2015=OnePlus 8 Global Version Model unless you go back and use MSM Tool again with the original ops.

 

[Aulgreg38]

Thanks thattechguy_69 for the shout out much appreciate that, just glad I was able to help

 

[thattechguy_69]

Dear OnePlus 8 community,

This is my last time visiting y'all. Thank you for all the support and help you guys have gave me throughout the past year. You guys were the first community that I was a part of. I have now retired my OnePlus 8. This device is what entered me into the realm of XDA in the first place. This place will always be a part of my heart and I will cherish the memories I have experienced with it. This guide will be a step-by-step summary of all the guides scattered in the OnePlus 8 Guides Section. A reminder to the next OnePlus 8 users, don't let this community die and keep the old OnePlus Never Settle spirit, alive!

Sincerely, Aaron
22 November 2022​

Credits to these amazing people for making this possible:

• @matteosaeed and his Guide.
• Ms. user_ajusee's Guide
• Mr. gregoryaul (@Aulgreg38) from HighOnAndroid Forums
• THE MAN HIMSELF: Mr. Max Lee of HighOnAndroid Forums; link to his YouTube channel.
• @MohmmadUzairKhan for figuring out the details for instant bootloader unlock that also came with dual sim
• @Mason220 for providing unlock.ops for the Verizon models which also happen to work on T-Mobile models
• @Some_Random_Username for the MSM Tool and instructions

 

[thattechguy_69]

Thanks thattechguy_69 for the shout out much appreciate that, just glad I was able to help

Oh thank you Mister!

 

[Adriancris7]

Hi man i do everthing like the post say and i got it. But i notices that when you convert t-mobile oneplus 8 to global you lose safetynet. so i was wondering 2 things. How can i get safetynet working again, and if i relock the bootloader with the global firmware will it boot or it will break? Thanks mate.

 

[thattechguy_69]

Hi man i do everthing like the post say and i got it. But i notices that when you convert t-mobile oneplus 8 to global you lose safetynet. so i was wondering 2 things. How can i get safetynet working again, and if i relock the bootloader with the global firmware will it boot or it will break? Thanks mate.

If you lock bootloader the system will say your phone has been corrupted and if you did happened to lock your bootloader. You are gonna have to use MSM tool to restore OS and your are gonna have to start again to step 1.

For the other issue which is safetynet, did you root your phone? From what I know you would only lose your safety net when you root your phone. I did root my phone 2 weeks ago and from what I remember my safetynet was fine. You are gonna have to ask someone about safety net man since I am no expert at that region.

Anyways, thank you for using this guide. Really appreciate it man

 

[Adriancris7]

If you lock bootloader the system will say your phone has been corrupted and if you did happened to lock your bootloader. You are gonna have to use MSM tool to restore OS and your are gonna have to start again to step 1.

For the other issue which is safetynet, did you root your phone? From what I know you would only lose your safety net when you root your phone. I did root my phone 2 weeks ago and from what I remember my safetynet was fine. You are gonna have to ask someone about safety net man since I am no expert at that region.

Anyways, thank you for using this guide. Really appreciate it man

Ok, I see.. I didn't root the phone. I just want to know. It's just I try to install Netflix in play store and the app didn't show.... So I install safetynet test and shows that it's not working... I don't have plane to root the phone. I only want to convert the phone to global... I don't know how to solve the issue of safetynet.. that why I ask you. Anyway the phone is working flawless no issue at all.

 

[thattechguy_69]

Ok, I see.. I didn't root the phone. I just want to know. It's just I try to install Netflix in play store and the app didn't show.... So I install safetynet test and shows that it's not working... I don't have plane to root the phone. I only want to convert the phone to global... I don't know how to solve the issue of safetynet.. that why I ask you. Anyway the phone is working flawless no issue at all.

Ok so I check my Play Store Certification and I just found out that my device has not been certified which means that's the reason why you couldnt install/update Netflix.

 

[Adriancris7]

Ok so I check my Play Store Certification and I just found out that my device has not been certified which means that's the reason why you couldnt install/update Netflix.

Yeah, that's what I told you. How can we solve the issue. It's the only bug I've found.

 

[thattechguy_69]

Yeah, that's what I told you. How can we solve the issue. It's the only bug I've found.

Download "Device ID" and copy Google Service Framework (GSF) and then paste it on this link
https://www.google.com/android/uncertified/ , just wait for Google to Verify your device. If it does not work then just download apk on apkmirror or revert back to T-Mobile ROM. I am in the process of trying to get mine also certified.

 

[Oneplus8rooter]

This worked for me, but had the same issue with the safetynet and thus can't use google pay. Just submitted the GSF for google to verify. Did google verified your device yet?

 

[thattechguy_69]

This worked for me, but had the same issue with the safetynet and thus can't use google pay. Just submitted the GSF for google to verify. Did google verified your device yet?

I changed my ROM to Pixel Experience because of OOS 11 battery issues and etc. But I dont think it did certify my device. Did some research on this before I switch and someone said it should certify your device but it wont say it. Another method I heard is to clear cache and storage cache on Play Store App and it should but I have never tested this one. The most sure method I saw was to root phone and bypass.

 

[Oneplus8rooter]

I changed my ROM to Pixel Experience because of OOS 11 battery issues and etc. But I dont think it did certify my device. Did some research on this before I switch and someone said it should certify your device but it wont say it. Another method I heard is to clear cache and storage cache on Play Store App and it should but I have never tested this one. The most sure method I saw was to root phone and bypass.

Yeah, I tried the play store app and gpay cache and storage cache clearing with no luck. I use gpay with NFC quite often so it was a bummer that it won't work without being certified. Thanks you for writing the guide regardless!

 

[thattechguy_69]

Yeah, I tried the play store app and gpay cache and storage cache clearing with no luck. I use gpay with NFC quite often so it was a bummer that it won't work without being certified. Thanks you for writing the guide regardless!

So sorry man. Thanks for letting me know it worked tho! You should try pixel experience tho. It is certified

 

[Oneplus8rooter]

So sorry man. Thanks for letting me know it worked tho! You should try pixel experience tho. It is certified

Yeah, everything else seems to work well besides that.

As much as I would like to try the other ROM, do they keep up with security patches? I just bought this phone used (Tmobile unlocked) and haven't rooted an android for a while and wasn't sure if they still get updates directly from google or some volunteer is maintaining the ROM. Would like to root it to whatever ROM that is the most maintenance free and would support security updates at least for a couple of years. I think oneplus support it up to 2023 for oneplus 8 if I'm not wrong.

 

[thattechguy_69]

Yeah, everything else seems to work well besides that.

As much as I would like to try the other ROM, do they keep up with security patches? I just bought this phone used (Tmobile unlocked) and haven't rooted an android for a while and wasn't sure if they still get updates directly from google or some volunteer is maintaining the ROM. Would like to root it to whatever ROM that is the most maintenance free and would support security updates at least for a couple of years. I think oneplus support it up to 2023 for oneplus 8 if I'm not wrong.

Yes they do keep up with updates but the people that are maintaing it are not from google. But I will assure you that it is way smoother and more optimized that the current oos 11. I also bought my phone recently 1 month ago as used! You can check some youtube channels if you are interested in pixel experience. Also changing rom does not require root so you dont have to tinker with safetynet and stuff

 

[Oneplus8rooter]

Yes they do keep up with updates but the people that are maintaing it are not from google. But I will assure you that it is way smoother and more optimized that the current oos 11. I also bought my phone recently 1 month ago as used! You can check some youtube channels if you are interested in pixel experience. Also changing rom does not require root so you dont have to tinker with safetynet and stuff

Wow, that looks really good. I might just try that out instead of going back to t mobile stock. Thank you!!

 

[thattechguy_69]

Wow, that looks really good. I might just try that out instead of going back to t mobile stock. Thank you!!

Here are the instructions and Follow THE GUIDE AND I MEAN IT: https://wiki.pixelexperience.org/devices/instantnoodlep/install/

you have to be in the latest oos 11 and in the last part of the guide, you can lock back the bootloader by replacing avb key with a custom one. If you dont update to the latest. It will keep saying system ui not working. Learned it the hard way and was hard stuck for 3 days lol. The os itself is directly from the pixels but with added features that was unique from oxygen os so google will think you have a pixel.

 

[Oneplus8rooter]

Here are the instructions and Follow THE GUIDE AND I MEAN IT: https://wiki.pixelexperience.org/devices/instantnoodlep/install/

you have to be in the latest oos 11 and in the last part of the guide, you can lock back the bootloader by replacing avb key with a custom one. If you dont update to the latest. It will keep saying system ui not working. Learned it the hard way and was hard stuck for 3 days lol. The os itself is directly from the pixels but with added features that was unique from oxygen os so google will think you have a pixel.

You are a godsend sir!! Looks like I'll be tinkering with it tonight! Thank you so much!

 

[thattechguy_69]

You are a godsend sir!! Looks like I'll be tinkering with it tonight! Thank you so much!

No problem!!! Just love helping people