I loaded a 6T and a 5 from 1.81 /e/ R Android 11 to Android 13 /e/ T using the T zip with adb sideload, with no issues so far. OnePlus 5 had apps and pictures.
Took off password, and had developer options: usb debug, oem unlock, and file transfer setting for usb. See link where I might have mentioned more.
Can’t say you’ll get the same results, but T seems like a win for me! I’ll still be backing up my daily OP 6T before I try it again!
