I have problem also, the wireless charging seem to be keep off & on. The DC voltage/amp meter that connected to charger show that the phone try negotiate on higher voltage which is 15v above which normally won't occur for long charging. What I do now is temporary replace the orig charger which...
just done dirty flash this rom from v20.1.21 to v20.2.20 on my Mi9, now wifi icon will show which wifi channel(2.4Ghz or 5Ghz) you connected. I also notice the animation become slower. Camera working so far
I also having same problem, manual download(both sourceforge & androidfilehost) or use updater also same, zip signature error on TWRP. But if I manually do md5 checksum on file, it is correct, very strange.
try to clear the camera apps from memory then clear the data of the camera on setting-->apps. Try open the camera again, it will open for 1st time. Press home, then press recent apps button & lock the camera app. This is temporary solution for me.
I dirty flash from v9.12.27(EU beta) with Magisk v20.2 to v20.1.4(EU beta). At 1st I though is Magisk that I install, later try dirty flash without Magisk also same result.
good news, there is a work around, try to lock the camera apps in memory then the camera will work after close.
Mi9 camera apps seem to be got problem after upgrade to 20.1.4, camera apps keeps stopping. After clear data for camera, it will works first time you open it but once close the camera app & open back, it will not open again & come out "camera keeps stopping" error.