after formatting sdcard0, I cannot install anything from sdcard anymore, recovery either reads "cannot mount sdcard" or "no files found"
seems like they erased everything...? that includes the ROM and gapps etc too right? lol. can't mount storage either
yes it formatted all.
But you don't put all files in an external card? If you take them in internal and than have to flash someting, you're in an impossible state... Get an external sdcard ,put all in and retry
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