In order to hard reset a Philips X800, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Philips X800 device will be brought back to the default configuration of a brand new device.
1. Turn on the phone.
2. Press the Call button to open the dialer. Type in this code: #20021208# or *01763*737381#.
3. Confirm the factory reset process and wait for your phone to reset'n'restart. That is all.