*** 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
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
7. Once phone is in EDL Mode, immediately Click ENUM button and then START button
Wait approximately ~250-300 seconds.
Device will reboot afterwards.
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
9. Once device isrecognized by terminal, copy and paste this other command
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.
2. Open Fastboot ROM Folder, click flash-all.bat and type and enter "y" to the terminal
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:
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.
*** You will lose all data
*** Backup your working modem and persist, just in case.
*** USE USB 2.0 Port and Windows Machine
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
Code:
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
- via ADB command
Code:
adb reboot edl
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 steps1. 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
Code:
fastboot devices
Code:
fastboot flashing unlock
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 ROM2. Open Fastboot ROM Folder, click flash-all.bat and type and enter "y" to the terminal
Code:
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:
Code:
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.
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