mi 8 explorer rom bug flash stock how to

I am not sure what I did, but, my Mi 8 EE seems to not able to access or use the storage anymore(can't copy or paste anything at all via USB, can't be access in the phone either)...? I am using https://xiaomi.eu/community/threads/miui-10-0-10-1-10-2-stable-release.47170/ I can't get to flash...