You're looking for a guide on the Handy T700X firmware. I'll provide you with some general information and point you in the right direction.
If the firmware becomes sluggish or you are locked out, a hard reset can restore the device to its original factory state (Handy OS 2.0): Power off the device. Press and hold Power Button simultaneously. When the logo appears, release the buttons to enter the Android Recovery Menu Use volume keys to select Wipe data/factory reset and confirm with the Power button. 3. Firmware "Bypassing" (FRP) Many secondary-market Handy T700X units encounter Factory Reset Protection (FRP) handy t700x firmware