Sorry for noob question, what to do "Dirty wipe"? TWRP -> Wipe -> Advanced wipe -> Dalvik/ART cache, Cache, System or something else?
Edit// Wiping Dalvik/Art, Cache and System didn't help. Every app keep crashing, also System Launcher.
If I want to downgrade to 8.8.2 (Mi6) should I wipe everything (I preffer not do that) and then flash 8.8.2? When I simply flash 8.8.2 on 8.8.9 I've got bugged settings (transparent lines)