Hard Reset on BRAVIS A506

How to Hard Reset on BRAVIS A506 Crystal?

Make sure you turned off the device.
Hold down the Volume Up key and the Power button.
Wait until the "Boot Mode" appears and then release the keys.
Next choose "Recovery Mode" using the Volume keys.
Press the Power key if Android logo appears on the screen.
Now select "Wipe data/Factory reset" using the Volume keys and the Power button.
Choose "Yes" using the same keys.
Press "Reboot system now" to complete the process.
Nice work! After these actions, the data on your device will be deleted.