by Hard Reset
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 X3-02 hard reset
Restore original settings
If your device is not working properly, you can reset some settings to their original values.
1 End all calls and connections.
2 Select Menu > Settings and Rest. fact. sett. > Settings only.
3 Enter the security code.
This does not affect documents or files stored on your device.
After restoring the original settings, your device switches off and then on again. This may take longer than usual.
security code 12345.
The default lock code is 12345.
Try this code: *#7380#
Update device software using your PC
You can use the Nokia Ovi Suite PC application to update your device software. You need
a compatible PC, a high-speed internet connection, and a compatible USB data cable to
connect your device to the PC.