[OnePlus Nord N200 5G] dave200atlantic:
This does not require an unlocked bootloader.

This will convert your t-mobile or metro pcs phone to the international unlocked version using the MSM flash tool graphical user interface in under 400 seconds. You will have an exact clone of the unlocked variant. No coding or command line knowledge is required.

After flashing the MSM file you will be able to unlock your bootloader without having to request an unlock token from OnePlus Metro or T-Mobile. All traces of T-mobile Metro and Amazon software will be entirely removed. The t-mobile bootloader animation will replaced with the oneplus oem animation. The phone will be fully functional and work better.

This will not unlock the sim.

Make a sim unlock request to your carrier or wait the required time from purchase activation. Flash back to the T-Mobile / metro variant with the T-mobile / metro MSM unbrick tool which can be found on the internet. Use the carrier unlock tool in phone settings than re-flash my modified firmware link below and your sim will be unlocked.

Do not troll this thread for carrier sim unlock requests or bootloader unlock requests. Contact your carrier.

If you have difficulty using the MSM tool you may search the Internet and their are many guides on the subject.

I am not responsible if anything goes wrong this will be at your own risk however I will try to fix what ever it is.

* * *

Steps to covert your phone:

First download the .zip file here.

OnePlus Nord N200 T-Mobile Metro Convert to Global OxygenOS 11.0.3.zip

drive.google.com

Note:

People have mentioned here the result is the Android 11 stock oxygen rom. This is because the only unbrick tool for this phone is A11 and that is all I had to work with. My suggestion is once you have converted simply take all the OTA updates as you would from any OnePlus phone from settings "about phone" to A12.

Note:

MSM only works with windows 7 and up. It will not work in a vm with Linux host.

Unzip the file and install the Qualcomm driver included in the zip package. Driver signature enforcement will be automatically disabled after you reboot your computer.

Note:

If it is already installed from a previous unbrick operation you must disable driver signature enforcement on your computer.

Power off phone.

Enter fastboot.

On phone depress volume up down and power until vibrate. Release.

Select power off.

Hold volume up and down and connect USB to computer. Release volume buttons.

Run MsmDownloadTool V4.0.exe

Select '"others"

Select "next"

Select "start"

Phone will reboot and conversion is complete.

For your convenience I have uploaded my modified international unlocked version of the MSM unbrick tool to convert carrier and sim locked T-Mobile/Metro variants to unlocked global version firmware.

This is for the OnePlus Nord N200 Metro / T-Mobile hardware variant phone only and the zip file for converting your phone is provided here for your convenience.

How I patched the firmware:

https://droidwin.com/convert-oneplus-t-mobile-metro-to-global-on-locked-bootloader/

If you need to go back to t-mobile / metro to use the sim network unlock app or other reasons I have uploaded a patched t-mobile / metro rom to revert back from global US here. Other unbrick MSM files wont work so you need to use this.

Nord N200 Covert back to tmobile Metro.zip

drive.google.com