Convert T-Mobile to International (with Bootloader Re-LOCK)

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Very interesting. As I thought OnePlus 8T TMO might be the same as OnePlus 8 on this dual sim issue, I looked it up in their threads. OP 8T do have a modified MsmDownloadTool to convert their device to a global version and dual sim works after the conversion, but two slots also share the same IMEI !


The dual sim problem OnePlus 8 TMO faces may not be caused by duplicate IMEI, but other software constrains. Let's dig it further!
yeah thats the thing, thats why we need a modded msm tool for someone to create because it just works. there used to be a bounty on it but it got removed from the threads because of rule violation i guess
 
Nov 6, 2021
24
18
Thanks for the reply. I guess I should return the SIM tray then.
Yeah, unfortunately I was not able to get sms working either... I also have the same IMEI for both sim... So maybe that might be a stumbling block for US carriers? I saw on another form that someone in Pakistan was able to somehow changed the 2nd sim's IMEI and got both sims working but no one else sends to be able to do it.
 

dlhxr

Senior Member
May 26, 2011
544
508
New York City
OnePlus One
OnePlus 3
Yeah, unfortunately I was not able to get sms working either... I also have the same IMEI for both sim... So maybe that might be a stumbling block for US carriers? I saw on another form that someone in Pakistan was able to somehow changed the 2nd sim's IMEI and got both sims working but no one else sends to be able to do it.

I don't think it's a US carrier issue. 8T is doing dual sim good with the same IMEI in US. Look at this.

So it is still a mystery why 8 TMO can't use dual sim.
 

this_is_nick6

Senior Member
Apr 18, 2011
82
61
31
Halifax
OnePlus 8
I managed to successfully convert my OP8 to the global version this morning.

Here are a few things I can confirm:

- 5G and VoLTE are working on my device (Rogers network in Canada)
- Banking apps work as expected
- Widevine certification is exactly as it was prior (L1), meaning I can stream in full HD/HDR with Netflix
- I was able to OTA update to the latest 11.0.10.10 without any issues at all

My first attempt trying this was a month ago. I was lazy and didn't roll the phone all the way back to Android 10 using the MSM tool. So I tried using "flash-all" with a newer global package and it did not work (crashdump error). Figured it was worth a shot... for whatever reason it just doesn't work. Ended up restoring with the MSM tool.

This time, I did this:
  1. Reverted back to official T-Mobile Android 10 using the MSM tool
  2. Unlocked my bootloader using the all-in-one tool + my unlock token
  3. Used the all-in-one tool to flash the global fastboot ROM (Android 10) linked in the original post
  4. Manually flashed the EU update from the device (also linked in original post)
  5. Locked the bootloader using the all-in-one tool
  6. Used the Oxygen Updater app to download the latest global full release (11.0.9.9) and installed it from my device
  7. Performed an OTA update, bringing me to 11.0.10.10
Sorry for the long post. I thought it might help someone else out since I modified a few steps from the original post and found success with this approach.
 
I managed to successfully convert my OP8 to the global version this morning.

Here are a few things I can confirm:

- 5G and VoLTE are working on my device (Rogers network in Canada)
- Banking apps work as expected
- Widevine certification is exactly as it was prior (L1), meaning I can stream in full HD/HDR with Netflix
- I was able to OTA update to the latest 11.0.10.10 without any issues at all

My first attempt trying this was a month ago. I was lazy and didn't roll the phone all the way back to Android 10 using the MSM tool. So I tried using "flash-all" with a newer global package and it did not work (crashdump error). Figured it was worth a shot... for whatever reason it just doesn't work. Ended up restoring with the MSM tool.

This time, I did this:
  1. Reverted back to official T-Mobile Android 10 using the MSM tool
  2. Unlocked my bootloader using the all-in-one tool + my unlock token
  3. Used the all-in-one tool to flash the global fastboot ROM (Android 10) linked in the original post
  4. Manually flashed the EU update from the device (also linked in original post)
  5. Locked the bootloader using the all-in-one tool
  6. Used the Oxygen Updater app to download the latest global full release (11.0.9.9) and installed it from my device
  7. Performed an OTA update, bringing me to 11.0.10.10
Sorry for the long post. I thought it might help someone else out since I modified a few steps from the original post and found success with this approach.
this is definitely way faster thanks for the update!
 

spv211723

New member
Jan 5, 2022
1
0
since its brand new then you have to request an unlock code from tmobile to unlock bootloader which would take 7 days and if you are gonna do this method, make sure to lock bootloader so you can use other apps like banking and etc.
Is there an option to get carrier unlock code elsewhere? I have brand new TMO OP8 that's locked and i am not associated to TMO. Pls advise.
 

Snekxs

Senior Member
Nov 16, 2017
113
57
OnePlus 8
OnePlus 8T

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blair.sadewitz

Senior Member
Dec 24, 2014
246
53
yeah thats the thing, thats why we need a modded msm tool for someone to create because it just works. there used to be a bounty on it but it got removed from the threads because of rule violation i guess
There are other tools able to flash this phone; I'm pretty sure qfil could do it, at the very least. There isn't anything proprietary to OnePlus; this phone speaks the Sahara protocol just like all the other devices with Qualcomm SoCs. There's a GitHub repository containing a tool someone developed that can decrypt the ops firmware files. I played around with it a while ago, and the ops file contains the firehose programmer, so there is no reason it couldn't be done by anything that speaks the Sahara protocol.



Decrypt and unpack the firmware archive (ops file), and you'll see that all the files you need are there. I don't recall if contains the partition info in the right format, but that could be converted. I'm almost positive that everything you need is in that archive. I didn't really try to do anything with it because msmdownloadtool worked.

Here is a tool you can use when the phone is in edl mode to play around with it:


Here is a tool to recreate the flash image:


Also this:


Also note:

python3 backdoor.py "MsmDownloadTool V4.0.exe"'

 
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blair.sadewitz

Senior Member
Dec 24, 2014
246
53
I am confused between this guide and the old one " Covert to Global ( WIP ) . Which one is best guide to convert OP8 TMO Android 11 to Global ?
Should I back up/ change modem with this guide ?
Is there diff between EU and Global ROM/modem/etc. to use 5G in USA and other oversea countries ?
I want Always On Display ( AOD ) , which ROM EU or Global will have it ?
TIA

Yeah, it's not entirely clear to me, either.

This is what you should do:

(1) Put your phone back on Android 10 TMobile firmware using one of the packages with msmdownloadtool. I used 10.5.7

(2) Unlock bootloader.

(2*) Get TWRP boot image. Put phone in fastboot mode, type:

fastboot boot twrpimage.img

After TWRP boots, take a backup of your persist and modem partitions (I recommend using dd to do it, here's an example: dd if=/dev/block/boot device/by-name/persist of=/sdcard/persist.img.ext4). You could probably use TWRP to do the backup, but that's on you. Transfer them off of the phone and safeguard them.

Now reboot from TWRP to fastboot mode. Unlock the bootloader, reboot to fastboot mode, and flash a 10.x euro or global ROM with fastboot. The guide says Euro, but I suspect you could use global, also. The goal is to have it running 10.x firmware (that's not for a carrier variant). After that boots, download the latest global OTA zip onto your internal sdcard. Open the updater in Settings, then select the file. After it updates, reboot to see if everything is OK. If it is, boot to fastboot and relock the bootloader.

The
 

sbaba127

New member
Nov 27, 2019
4
0
After I convert to global. I lost SIM signal. How can I backup working MDEM beforehand and how to restore it?
 

Mickey1987

Member
Nov 20, 2021
8
2

belaidabeddz

New member
Jan 12, 2022
1
0
I managed to successfully convert my OP8 to the global version this morning.

Here are a few things I can confirm:

- 5G and VoLTE are working on my device (Rogers network in Canada)
- Banking apps work as expected
- Widevine certification is exactly as it was prior (L1), meaning I can stream in full HD/HDR with Netflix
- I was able to OTA update to the latest 11.0.10.10 without any issues at all

My first attempt trying this was a month ago. I was lazy and didn't roll the phone all the way back to Android 10 using the MSM tool. So I tried using "flash-all" with a newer global package and it did not work (crashdump error). Figured it was worth a shot... for whatever reason it just doesn't work. Ended up restoring with the MSM tool.

This time, I did this:
  1. Reverted back to official T-Mobile Android 10 using the MSM tool
  2. Unlocked my bootloader using the all-in-one tool + my unlock token
  3. Used the all-in-one tool to flash the global fastboot ROM (Android 10) linked in the original post
  4. Manually flashed the EU update from the device (also linked in original post)
  5. Locked the bootloader using the all-in-one tool
  6. Used the Oxygen Updater app to download the latest global full release (11.0.9.9) and installed it from my device
  7. Performed an OTA update, bringing me to 11.0.10.10
Sorry for the long post. I thought it might help someone else out since I modified a few steps from the original post and found success with this approach.
Did you try dual sim !?
 

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  • 1
    yeah in my experience on oos 12 but it was gone after c.16
    Thanks for the quick response. I'm on IN2015_11_C.16 as well. Hopefully it goes away after the next update.
    1
    yikessss, can you backup everything and maybe downgrade to oos 11?
    I'd probably have to msm back to T-Mobile software and decide if I want to try converting to global again... Ugh... PITA!

    I just looked at my info and for some reason it says I am still on c.16, but I know I had told it to install c.20, so something is borked up....

    Cheers,
    B.D.
  • 11
    The required files will be attached in the end of this guide.
    OnePlus 8 TMobile to Global Fastboot ROM
    MSM TOOL for IN2017

    Alternatives from the files above, if you get errors every time you are trying to flash like "NO SIM INSTALLED"
    (THIS IS WHAT I PERSONALLY USE):
    MSM TOOL for IN2017 Alternative
    OnePlus 8 Fastboot ROM Alternative

    1st Step: (Make sure Test Mode is ON and Driver Signature is OFF)
    First install the Drivers of the phone and the Qualcomm Drivers inside the DRIVERS.zip attached to this thread.

    2nd Step: Make sure your OnePlus 8 IN2017's bootloader is unlocked- unlocking bootloader will result to factory resetting your phone. Please backup your phone before doing this process. Instructions on how to unlock

    3rd Step: After the bootloader is unlocked, you have to enable "USB Debugging" and reboot your device to Fastboot Mode.

    4th and Last Step: Unzip the ZIP file and Open the Global Rom (10.5.12 OnePlus 8 Global Rom). Find flash-all.bat and double click on it. Type and enter Y when it asks to and just let it do its Terminal Process.

    **After the batch file is done, your phone should automatically boot to Global Rom Oxygen OS and no more of that T-Mobile
    splash screen.

    This is a YouTube walkthrough video on how to do it: Credits to Fizzy Apps on YouTube


    DO NOT LOCK YOUR BOOTLOADER YET, TO LOCK BOOTLOADER (THIS WILL WIPE EVERYTHING):
    -Download the latest OxygenOS 11 ROM
    -Move the downloaded ROM from "Downloads" folder to "Internal Storage"
    -Go to settings and find System Update, then press Local Update and choose the downloaded ROM
    -After its done installing, click REBOOT/Restart the device
    -After rebooting, go into FASTBOOT MODE and when you are in FASTBOOT MODE, type "fastboot oem lock"
    -Press the volume buttons to select LOCK BOOTLOADER and there you go, LOCKED Bootloader!

    IF SOMEHOW YOU GOT "QUALCOMM CrashDump Mode" during the 4th step or you locked Bootloader right after flashing ROM and it got corrupted.

    1) Enable Test Mode and Disable Driver Signature Verification on Windows PC.

    2) On your phone, simultaneously press and hold Volume Up (+) and Power Button and when the screen shuts down, IMMEDIATELY release both buttons. This means you forced shutdown the device.

    3) Set year date on your PC to 2017 and Turn off WIFI for MSM Tool to work and after doing this, open MSM TOOL folder you downloaded at the top of this guide and click MsmDownloadTool V4.0.exe

    4) On Login, set user type to "OTHER" and click next. at the top left side find "TARGET" and set it to O2/TMO

    5) While simultaneously holding both the volume buttons, connect the phone to the PC. As soon as the phone is connected, a COM# like COM3, etc. will appear on the MSM Tool and immediately click ENUM, then click COM#, then Start. (If COM# doesn't show up just continue to click the ENUM button during process and it should show up)

    <A YouTube Video walkthrough of this process> Credits to Shahin Shaan for this.

    **This should start the process of restoring your phone back to OxygenOS 10 and you have to start back to square 1 in order to flash Global ROM again. So, USB Debugging>Fastboot Mode>Unlock Bootloader>Enable USB Debugging Again>Boot again to Fastboot>Double Click on flash-all.bat on Global ROM folder. Also, I added TOOL ALL IN ONE which should make unlocking bootloader, booting to Fastboot faster.



    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 himself of HighOnAndroid Forums; link to his YouTube channel.
    10
    I tried again, MSM to 10.5.7, unlocked bootloader, rebooted to bootloader, flash-all.bat, and I'm still getting errors on the critical partitions. And I can't figure out how to unlock the critical partitions (probably not allowed in TMo firmware).

    I'm going to MSM to 10.5.22 and see if that makes any difference.

    EDIT: No dice. 10.5.22 made no difference. The issue is the locked critical partitions. If anybody has any solutions please tag me.
    Sorry for spamming the board today, but I think I figured it out.

    Thanks to @thattechguy_69 for all the work here so far. This is just to help anybody who is having issues like I did.

    The "critical partitions" issue appears to be a DRIVERS issue, not a fastboot version issue or anything else with the actual phone or ROM files. I had installed all of the drivers that every guide said to install, but I stumbled upon this post by @FoxyDrew that solved my issue.

    Here's how I finally got into 10.5.12.IN21AA (Global ROM) on my IN2017:

    1. Just to be safe (not sure if it's necessary) boot into TEST MODE on your Windows machine. I did all of this from Test Mode.
    2. Download the files from the zip attached at the bottom of the first post on this thread. Install both files (OnePlus USB Drivers and QDLoader HS-USB Driver).
    3. At some point I THOUGHT I installed the Fastboot drivers, but maybe I messed that part up or maybe it was before I was in Test Mode. Regardless, download the Google fastboot driver zip in this post. Unzip it to your desktop.
    4. Open the extracted folder and then the usb_driver folder inside, then right-click on the android_winusb.inf file and select Install. Confirm the installation.
    5. Plug in your phone.
    6. Open Device Manager. Your phone should show up under "Universal Serial Bus controllers" as "IN2017" when it is in CHARGING ONLY mode, and under Portable Devices when in File Transfer mode or PNP mode. If not, you'll need to fix your USB drivers from step 2 above.
    7. Make sure you can get adb commands to work, then reboot to the bootloader ("adb reboot bootloader" should get you to the FastBoot Mode menu with the big green "START" banner at the top) and make sure fastboot commands also work ("fastboot devices" will show you if your phone is detected properly).
    8. Check Device Manager again while in bootloader mode - your phone should now show up under "Android Phone" as "Android Bootloader Interface." If it shows up as IN2017 with an exclamation mark, you need to fix the issues with the fastboot driver in step 4 above. I actually did this step while at the "waiting for device" message while flashing the Global ROM and it kick-started the installation's second phase.
    9. I also followed some steps from this post by @awsan - I copied the entire platform-tools folder that I downloaded from his post (r31.0.2) into the 10.5.12-GLOBAL folder, replacing all duplicate files. I don't think booting into fastboot like he says to do (language selection splash screen) worked, I had to boot into the bootloader from there to get the flash-all.bat to start.
    10. From here, I think I just double-clicked the flash-all.bat and everything worked properly - with the note that I was stuck at "waiting for device" after the first reboot command in the middle of the installation. The process in step 4 got me through this.
    This fixed my issues with not being able to flash critical partitions (because I suspect they re-lock when fastbootd switches into bootloader if you manually do it). Now it doesn't hang at all. I am going to play around with this to make sure I didn't miss anything and see if it works with other TMo firmware versions and the newer 11.0 Global ROM.

    I have not tried locking the bootloader yet.

    Oh, and 5G and VoLTE both appear to be working.
    4
    I managed to successfully convert my OP8 to the global version this morning.

    Here are a few things I can confirm:

    - 5G and VoLTE are working on my device (Rogers network in Canada)
    - Banking apps work as expected
    - Widevine certification is exactly as it was prior (L1), meaning I can stream in full HD/HDR with Netflix
    - I was able to OTA update to the latest 11.0.10.10 without any issues at all

    My first attempt trying this was a month ago. I was lazy and didn't roll the phone all the way back to Android 10 using the MSM tool. So I tried using "flash-all" with a newer global package and it did not work (crashdump error). Figured it was worth a shot... for whatever reason it just doesn't work. Ended up restoring with the MSM tool.

    This time, I did this:
    1. Reverted back to official T-Mobile Android 10 using the MSM tool
    2. Unlocked my bootloader using the all-in-one tool + my unlock token
    3. Used the all-in-one tool to flash the global fastboot ROM (Android 10) linked in the original post
    4. Manually flashed the EU update from the device (also linked in original post)
    5. Locked the bootloader using the all-in-one tool
    6. Used the Oxygen Updater app to download the latest global full release (11.0.9.9) and installed it from my device
    7. Performed an OTA update, bringing me to 11.0.10.10
    Sorry for the long post. I thought it might help someone else out since I modified a few steps from the original post and found success with this approach.
    3
    Thanks for the guide!! I just submitted my request to T-Mobile to unlock my boot loader so now I play the waiting game... 😴
    In the meantime, can someone please clarify what does converting from IN2017 to International achieve? Ultimately my goal is to flash a custom ROM - not sure if I can do this directly after unlocking my boot loader.
    IN2017 is Tmobile version of the phone and updates are late and you cant sideload an update because it is not available on carrier versions of the phone. Converting it to International version gives access to the latest updates, and some other features that weren't available to Tmobile version. If you do this method, you will lose Safetynet which is the ability to use bank apps and etc. So after converting you have to lock the bootloader if you wish to do anything related to banking.
    3
    I am confused between this guide and the old one " Covert to Global ( WIP ) . Which one is best guide to convert OP8 TMO Android 11 to Global ?
    Should I back up/ change modem with this guide ?
    Is there diff between EU and Global ROM/modem/etc. to use 5G in USA and other oversea countries ?
    I want Always On Display ( AOD ) , which ROM EU or Global will have it ?
    TIA

    Yeah, it's not entirely clear to me, either.

    This is what you should do:

    (1) Put your phone back on Android 10 TMobile firmware using one of the packages with msmdownloadtool. I used 10.5.7

    (2) Unlock bootloader.

    (2*) Get TWRP boot image. Put phone in fastboot mode, type:

    fastboot boot twrpimage.img

    After TWRP boots, take a backup of your persist and modem partitions (I recommend using dd to do it, here's an example: dd if=/dev/block/boot device/by-name/persist of=/sdcard/persist.img.ext4). You could probably use TWRP to do the backup, but that's on you. Transfer them off of the phone and safeguard them.

    Now reboot from TWRP to fastboot mode. Unlock the bootloader, reboot to fastboot mode, and flash a 10.x euro or global ROM with fastboot. The guide says Euro, but I suspect you could use global, also. The goal is to have it running 10.x firmware (that's not for a carrier variant). After that boots, download the latest global OTA zip onto your internal sdcard. Open the updater in Settings, then select the file. After it updates, reboot to see if everything is OK. If it is, boot to fastboot and relock the bootloader.

    The