Unlocked unit XDA thread: https://forum.xda-developers.com/t/op8t-oos-kb05aa-ba-da-unbrick-tool-to-restore-your-device-to-oxygenos.4180837/

T-Mobile variant XDA thread: https://forum.xda-developers.com/t/op8t-oos-tmo-kb09cb-unbrick-tool-to-restore-your-device-to-oxygenos.4180981/