Do not confuse this with the ZTE Blade A51s (which has different specs) or the Blade A5 2020 . The hardware is different, and cross-flashing will kill the device.

If it ain't broke, don't fix it. The risk of losing your IMEI or bricking the device is too high for a simple "fresh install."

Keep it at at least 50% battery to prevent it from shutting down during the process.