: Dial *#*#7780#*#* for a factory data reset that keeps your system software intact.
: The firmware supports multi-language interfaces and basic Google services, provided the specific unit has been unlocked from its original hotel carrier profile. Recovery Tools handy t700x firmware
Tap . If a new version is available, follow the on-screen prompts to download and install. 2. Using the TCL Mobile Upgrade Tool : Dial *#*#7780#*#* for a factory data reset
(Source Code or Full Guide)
The printer will reboot automatically. Once the home screen appears, power off, remove the SD card, and delete the firmware file from your PC (to avoid accidental re-flashing later). Power the T700X back on. remove the SD card