Hard Reset Guide For Nokia 5800
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CAUTION: Before you read further, please make a back up of your device and make sure you understand that you are doing this at your own risk. We will not be held liable for any type of loss that may occur during the reset process
For Nokia 5800XM – use the following buttons to do a hard reset, /Green/Red/Camera keys pressed all at once on power up. This will only work on 5800′s that have firmware version 20. and up.

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*#7370# also works..