Unlocked units XDA thread: https://forum.xda-developers.com/t/opn105g-oos-86aa-89ba-unbrick-tool-to-restore-your-device-to-oxygenos.4204445/

Specific notes:

Crossflashing regional builds is no longer possible by EDL, flash is tied to device project ID. For reference EU devices project ID is 20889 while international devices project ID is 20886. See second attached screenshot on thread OP for reference.

T-Mobile variant XDA thread: https://forum.xda-developers.com/t/opn105g-oos-tmo-be88cb-unbrick-tool-to-restore-your-device-to-oxygenos.4245455/

Metro by T-Mobile variant XDA thread: https://forum.xda-developers.com/t/opn105g-oos-metro-be88cf-unbrick-tool-to-restore-your-device-to-oxygenos.4245461/