I installed lineage-16.0-20200206-nightly-FP2-signed.zip via the build in updater. TWRP version is 3.3.1-1. When I turned the display on it was just blue. Then I hold the power button until it made a reboot. I booted in twrp and installed yesterdays version. after the reboot there was a bootloop that leads into twrp. I had 20190823 on my pc and installed this one. No bootloop. I can enter my pin. But when I want to enter the gesture and it was 100% the correct one. then the screen goes black and I can only enter the gesture with the same result.
I found a solution for the gesture problem.
I booted in twrp and deleted the gesture from my phone. After the reboot I was greeted with an unprotected phone. But I can use it.
The main problem is now, that the google play service seems to be broken. I get many messages that it crashed. How can I solve this problem? Reinstall gapps, because the update has corrupted gapps?
Reinstalling gapps from the 20200205 was doing the trick. The play services are no longer crashing. But I was greeted with the “setting up the device” app. I can’t remember this one. Where did it come from?
A the moment I’m charging my phone, because putting a new android version on it and doing it again and again made the battery nearly empty. After that I will get the latest gapps version and the latest LOS update. I will install these two via sideload and see what will happen.
I have installed LOS 20200205 via the build in updater. This was the last version I had before the update bricked my phone. It was working. No strange things happend. Except all my saved wifis are gone. I think, I found a solution to this problem. I have to keep the very old LOS files from 2019. Because it seems they can be installed when everything else failed.
That was really the most difficult phone problem I ever had and at the moment the solution written above was completely made by myself. That is impressive for me.