Official sources:
Tap ; if an update is available, download and install it safely. ✅ Summary of Flashing Safety Firmware ZTE Blade A51
A failed flash midway through usually indicates a corrupted firmware file or a loose USB connection. Re-download the firmware file, extract it again, and ensure the phone remains perfectly still during the data transfer. Device Stuck on Boot Loop After Flashing Official sources: Tap ; if an update is