I bought a used i777 yesterday.. seller said that it has a problem with connecting to PC. i connected it to pc and it just charging only.can't mount storage.
im cwm also i cannot mount storage.. But internal storage seems fine..
i put it to download mode and flash it to stock ([Heimdall][Odin][Stock][Root]UCKH7/KK6 Return/Unbrick to Stock (or Root) by Entropy512)
it was successful .. but still have the issue.