I installed Hyperion custom ROM. Before installing it I made a complete backup. Then now I thought to switch back to my original OS − but it is saying some error like format failure, cant unmount system etc.
What could be the problem here?
Device name: Galaxy Y
Recovery tool: CWM
Custom ROM used: Hyperion
Error Report: Checking MD5 sum E:format_volume failed to unmount/system error while formatting/ system