Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.!
Nokia N9 hard resetReset your phone
Learn how to reset your phone, and how to restore the original settings.
If your phone stops responding
Restart your phone. Press and hold the power key for at least 8 seconds. To switch your phone on again, press and hold the power key.
No content, such as contacts or messages, is deleted.
Restore original settings
If your phone is not working properly, you can reset some settings to their original values.
End all active calls and connections.
Select Settings icon and Reset > Restore settings.
If prompted, enter the security code.
After restoring the original settings, the phone switches off, and then on again. This may take longer than usual.
Restoring original settings does not affect personal data stored on your phone, such as:
Documents, music, messages, or notes
Accounts, security codes, or passwords
Prepare your phone for recycling
If you buy a new phone, or otherwise want to dispose of your phone, Nokia recommends that you recycle your phone. Beforehand, remove all personal information and content from your phone.
Remove all content and restore settings to the default values
Back up the content you want to keep to a compatible computer.
End all active connections and calls.
Select Settings icon and Reset > Clear device.
Your phone switches off and then on again. Check carefully that all your personal content, such as contacts, pictures, music, videos, notes, messages, mails, presentations, games, and other installed applications have been removed.
Content and information stored on the SIM card is not removed.
Remember to remove your SIM card from the phone.
If it is not working try this code:
You can format your device by typing *#7370# in standby mode. Before the device is reset, you need to provide the lock code. The default lock code is 12345.
Some Nokia phone can be reset via this menu option
Press menu button or enter Menu > Settings > Phone > Phone management > Factory settings > Delete data and restore > YES
Formatting the device will permanently erase all user data and settings as well as add-on applications and operator specific settings.