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

[thattechguy_69]

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 !

[GUIDE] Convert TMO to EU via MSM Tool, no SIM Unlock or Bootloader Unlock needed!

*** Use this at your very own risk. *** You will lose all data *** Backup your working modem and persist, just in case *** Read the entire post and follow the steps closely before asking for help. Post all error messages and steps you took...

forum.xda-developers.com

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

 

[FernandoRocker]

if the second sim does not work for phone calls then best believe that it wont work on sms sorry.

Thanks for the reply. I guess I should return the SIM tray then.

 

[Oneplus8rooter]

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]

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.

[GUIDE] Convert TMO to EU via MSM Tool, no SIM Unlock or Bootloader Unlock needed!

*** Use this at your very own risk. *** You will lose all data *** Backup your working modem and persist, just in case *** Read the entire post and follow the steps closely before asking for help. Post all error messages and steps you took...

forum.xda-developers.com

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

 

[this_is_nick6]

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.

 

[thattechguy_69]

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!

 

[Snekxs]

Somehow in the process my model of my phone changed from IN2017 to IN2015 and can't unlock my bootloader now. And using a T-Mobile msm doesn't fix it

 

[spv211723]

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.

 

[thattechguy_69]

Somehow in the process my model of my phone changed from IN2017 to IN2015 and can't unlock my bootloader now. And using a T-Mobile msm doesn't fix it

try this version: https://androidfilehost.com/?fid=10763459528675572757
its 10.5.22

 

[Snekxs]

try this version: https://androidfilehost.com/?fid=10763459528675572757
its 10.5.22

Will try that now

 

[thattechguy_69]

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.

did you try to request an unlock code on the tmobile website? https://www.oneplus.com/unlock_token

 

[Snekxs]

try this version: https://androidfilehost.com/?fid=10763459528675572757
its 10.5.22

phone is back on in2017 but cant flash my token at all. attached image

 

[blair.sadewitz]

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.

GitHub - bkerler/oppo_decrypt: Oppo .ofp Firmware decrypter and oneplus .ops de-/encrypter

Oppo .ofp Firmware decrypter and oneplus .ops de-/encrypter - GitHub - bkerler/oppo_decrypt: Oppo .ofp Firmware decrypter and oneplus .ops de-/encrypter

github.com

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:

GitHub - bkerler/edl: Inofficial Qualcomm Firehose / Sahara / Streaming / Diag Tools :)

Inofficial Qualcomm Firehose / Sahara / Streaming / Diag Tools :) - GitHub - bkerler/edl: Inofficial Qualcomm Firehose / Sahara / Streaming / Diag Tools :)

github.com

Here is a tool to recreate the flash image:

GitHub - NHellFire/android-qfil-unsparse: Tool to reassemble the sparse images used by Qualcomm Flash Image Loader

Tool to reassemble the sparse images used by Qualcomm Flash Image Loader - GitHub - NHellFire/android-qfil-unsparse: Tool to reassemble the sparse images used by Qualcomm Flash Image Loader

github.com

Also this:

https://gist.githubusercontent.com/Kochise/38933551e751a1a567c8b81ac2e01a03/raw/8f8eecc1ba8a2b3a4c725f678cff63f4819ec0d6/QFILUserGuide.txt

Also note:

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

oppo_decrypt/backdoor.py at master · bkerler/oppo_decrypt

Oppo .ofp Firmware decrypter and oneplus .ops de-/encrypter - oppo_decrypt/backdoor.py at master · bkerler/oppo_decrypt

github.com

 

[Mickey1987]

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.

Have you tried to put a sim card in it yet? If not then you can carrier unlocked the OP8

 

[blair.sadewitz]

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]

After I convert to global. I lost SIM signal. How can I backup working MDEM beforehand and how to restore it?

 

[thattechguy_69]

After I convert to global. I lost SIM signal. How can I backup working MDEM beforehand and how to restore it?

Use this MSMTool: https://androidfilehost.com/?fid=10763459528675572757 and backup the MODEM with root. I doubt flashing the modem is gonna work since this was my stopping point. Just like you i lost signal and now didnt bother converting global anymore because i lose sim card functionality.

 

[Mickey1987]

After I convert to global. I lost SIM signal. How can I backup working MDEM beforehand and how to restore it?

[GUIDE][WIP]T-Mobile Brand Conversion to Rooted Global Firmware

First, let me say that this is only an attempt to pull this information out from a lot of different threads that require a bunch of research and a lot of institutional knowledge of Android. The idea of this thread is going from 100% T-Mobile...

forum.xda-developers.com

 

[Snekxs]

Weird. after using msm by phone will just crash and then boot into android 11 with a different model number

 

[belaidabeddz]

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 !?