: Go to Settings > System > Advanced > System Update .

Click the in the tool to end the session. Disconnect your phone from the USB cable.

Because custom ROMs can introduce security vulnerabilities and stability issues, stock firmware remains the most reliable software for daily use.

Right-click on UpgradeDownload.exe and select .

Once the tool opens, click on the located at the top-left corner.

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Firmware Zte Blade — A51

: Go to Settings > System > Advanced > System Update .

Click the in the tool to end the session. Disconnect your phone from the USB cable.

Because custom ROMs can introduce security vulnerabilities and stability issues, stock firmware remains the most reliable software for daily use.

Right-click on UpgradeDownload.exe and select .

Once the tool opens, click on the located at the top-left corner.