In order to hard reset a Mitac MIO 8390, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Mitac MIO 8390 device will be brought back to the default configuration of a brand new device.
1. Turn off the phone.
2. Now connect it to the AC adapter.
3. Press'n'hold Volume control. Press End button for five seconds.
4. Let go of the End button when the phone turns back on. Let go of the Volume control when the phone vibrates twice.
5. After two minutes, your phone should turn back on again. Done!