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 Lumia 625 soft reset
If your phone freezes try to reboot it. Press and hold the power key for over 8 seconds. The phone will reboot. Update your phone software.
Nokia Lumia 625 hard reset
1. Turn the power Off. 2. Press and hold the Volume down and connect the charger or the USB cable with PC, for about 8 seconds, you will see an exclamation mark (!) on the screen. Note: If you do not press any of the following keys, then the phone wp8 will starts boot normally.
Then press the keys in this exact order: 1. Volume up 2. Volume down 3. Power 4. Volume down
Phone will restart, be patient.
resetting your Nokia Lumia 625 from menu
Reset your phone. This restores the factory settings, and erases all your personal content, including apps you've purchased and downloaded. On the start screen, swipe left, and tap Settings > about > reset your phone.
All data will be lost!
Factory reset Nokia Lumia from the menu
On the start screen Scroll down to the bottom of the screen. Tap arrow.