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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
  • We can only help you if you describe exactly what steps you took, and at what stage you got the error message you describe. – Dan Hulme Sep 3 '13 at 10:00
  • more clear i wiped data and cache then using CWM i went backup and restore and gave restore but i got error what i mentioned before – Vijay_07 Sep 3 '13 at 10:33
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You can switch to stock ROM for Galaxy Y by using the latest version of Odin and downloading the stock ROM. You can find these files in other forums.

  • need kies??? r zip file enough – Vijay_07 Sep 3 '13 at 12:00

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