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A corrupted file? You would need to format your memory card and phone.

To format memory card: Menu>Apps>File Manager>Memory card>Options>Memory Card Options>Format - this will delete everything on your memory card.

A hard reset (x6, 5800 and 5230 only) is done by the following (warning, this deletes all data on your phone):

1.) Turn off the phone and remove battery for 5min

2.) Reinsert battery

3.) Press and hold the green, red and camera buttons. DO NOT LET GO.

4.) While holding the three buttons, press the power key to boot the phone up.

5.) Keep on pressing until you see the country selection screen.

A correctly done hard reset would show you that everything on the phone (contacts, messages, calendar entries, etc) would be deleted. So it is advisable to back them up. Upon restoration, do not restore settings or files if possible.