Hi again, I flashed Android 11 and UT 20.04 after that and I am really happy for now. I switched on WiFi and 2G only, no other connections. The battery went from 89% to 86% within 7 hours, so that is very okay for me. Check! Thanks everyone for helping! greetz Chev Chelios

Hi MrRoughwood, Congratulations! And it's a very good decision to start with “stable.” Greetings Mario