Hi everyone! Recently I tried to flash my umidigi A9 pro with dotOS(GSI). At the time I didn't know that dotOS is based one android 11(the same version that my OEM ROM was). Now I want to install leafOS(still GSI). I read online and some page said I need to reinstall OEM rom before install new one. Other said I just need to wipe everything then just install via fastboot(adb). Right now I am a bit confused on this subject, so any help would be appreciated a lot. Thanks in advance!

I was using aurora store for awhile and today I got a notification tell me to update this app. I have no idea what it do exactly, but I always try to degoogle my phone as much as possible. It would help a lot if someone can give an answer. Thank in advance.