The most common reason. If your phone gets stuck on the ZTE logo, restarts endlessly, or displays a "System UI isn't responding" error, a corrupted system partition is often the culprit. Re-flashing the stock firmware is the only reliable fix.
Go back to the main settings, tap on 'system', and then 'advanced'. The developer options will then be visible near the bottom. YouTube·HardReset.Info Firmware ZTE Blade A51
Updating your ZTE Blade A51 firmware can bring numerous benefits, including: The most common reason
are typically around 1.00 GB to 4.00 GB depending on the region (e.g., GEN_EU_EEA) . tap on 'system'