Not really dev related but here it goes:

Decided to update some apps on my phone during lecture. Suddenly android crashes and is stuck in a bootloop. Went to safe mode where "downloaded" apps are disabled but wanted to at least be available via telegram. So I followed a guide to manually convert an app to a system app and tested with some random app that I didn't care for. That worked flawlessly and then decided to proceed with telegram but it said that moving failed but actually the folder was moved. I took the chance and rebooted (again to safe mode) only to find out that now the system ui crashes as soon as it loads, also rendering the safe mode useless.

Great that such things always happen when you don't have access to a trusted machine with adb installed.