How To Flash ZTE Switch X1 Official Stock Firmware:
1: Download the firmware on your computer or on your mobile.
2: After downloading extract the firmware.
3: You will get an update.zip file.
4: Copy the update.zip file the phone sd and flash it through the recovery mode.
Enjoy
ZTE_Switch_X1_V1.0.0B02_OTA_ 2.3.6.zip