GSM Hosting Files lists specific builds like the TEL_MX for Mexico and GEN_EU for Europe.
The easiest way to update your ZTE Blade A51 is through the built-in update system. Connect to a stable Wi-Fi network to avoid data charges. Open Settings and scroll down to System . Tap Advanced , then select System Update .
The ZTE Blade A51 is a durable, if unspectacular, device. Its firmware is the glue that holds it together. If your phone is bootlooping, flashing the stock ROM via SP Flash Tool is your best bet.