In order to hard reset a Sonim XP1300 Core, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sonim XP1300 Core device will be brought back to the default configuration of a brand new device.
1. Switch on the phone.
2. Go to Menu > Settings > Restore factory settings.
3. Type in 0000, which is the default passcode.
4. Select OK and Yes.
5. Phone will now reset & restart. Done.