Hard Reset for Sonim XP3340 Sentinel
In order to hard reset a Sonim XP3340 Sentinel, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sonim XP3340 Sentinel device will be brought back to the default configuration of a brand new device.
1. Power up the phone.
2. Go to Menu > Settings > Restore factory settings. 
3. Type in the phone's password, 0000 by default.
4. Now just allow the phone to reset'n'restart. Done!
Warning ! HardReset24.com is not responsible for any damage caused by our tutorials. You do it at your own risk.