Android 11 is the latest version pushed out by OnePlus.
While there is a /e/OS for the other versions of OnePlus 7T (example: HD1905) there might be enough of a difference that the eOS doesn’t load with the T-Mobile version. If I’m wrong please let me know.
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services
Looks like it may be possible if first you convert your phone to OOS11 Global version. Have a good read of this for some pointers:
LineageOS is a free, community built, aftermarket firmware distribution of Android 11, which is designed to increase performance and reliability over stock Android for your device.
LineageOS is based on the Android Open Source Project with extra...
@chrisrg I’m not sure that’s going to help the OP. According to the LOS documentation, the HD1907 is not on the list of supported devices (bottom right of page):
Of course, this could be a YMMV (“your mileage may vary”) situation and if the OP is up to trying… maybe we’ll all learn something new!