In order to hard reset a DEXP Ixion Z255, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
DEXP Ixion Z255 device will be brought back to the default configuration of a brand new device.
1. Power down the phone.
2. Now press'n'hold the Power and Volume Up buttons at the same time. Wait for the DEXP logo to pop on-screen and let go of both buttons.
3. If the Android logo pops on-screen, press'n'hold the Power and Volume Up buttons again.
4. Then select wipe data/factory reset. Do that by using Volume and Power buttons.
5. Select Yes - delete all user data from the newly opened menu, confirm with Power button.
6. Lastly, use Power button to select reboot system now. Voila!