I am on v219 and everything except fingerprint works.
When I flash A15 firmware before installing v219 then there is no option to add fingerprint or face unlock under Settings -> Security.
Could it be that A15 is too new and I need A13? If so where can I get it?
When I flash C25 firmware before installing v219 and I want to enable fingerprint I get the "Touch the sensor" message and it tells me the sensor is at the back of the phone. It also shows a green circle on the screen where the senor actually is but when I touch that nothing happens. Similar to this video:
The latter situation also happens when I use lineageOS. Other users in the lineageOS thread describe the same problem.
I've made a change to the dtbos relating to the display panel, forcing the display to 90 hz refresh rate.
Please make a backup of your dtbo partition first. if something goes wrong you cannot even boot into recovery and will have to flash the stock dtbo using fastboot.
Someone made 90hz display work on one plus 7 pro with custom gsi ROM. Hope we could get 90hz and BT soon.