If you want to look into specific options for your device, tell me:
If after factory reset the device asks for a previously synced Google account: How to unlock SUNMI V2 Pro - HardReset.info
Effect: Same as Recovery reset; useful when recovery menu won’t appear. If you want to look into specific options
This method also erases all data but is easier and doesn't require button combinations. How to unlock SUNMI V2 Pro - HardReset.info
On the next confirmation screen, navigate to or "Yes — delete all user data" and press the Power button again. Step 4: Reboot the System