The OnePlus 7T now has official LineageOS ROM support
(Android Police)

For when OP's buggy updates finally prove too much, you can get your own buggy updates, dammit OnePlus software tends to be among the best for Android devices. Its update process ... not so much, at least as of late. The OnePlus 7T, for example, had to wait half a year to get its Android 11 update, and some carrier variants took even longer. If you want to try out a new flavor of Android on your OnePlus 7T, now you can: there`s an official build of the LineageOS custom ROM available for it. Read More The OnePlus 7T now has official LineageOS ROM support was written by the awesome team at Android Police.