Unlock your phone and go to Settings .

Tap Install Now . The phone will reboot, install the update, and restart again.

A: Either you are on the latest version, or your carrier hasn’t certified the update yet. You can manually check after removing your SIM card (rarely forces a region check).

Scroll down and tap System (or About Phone on some UI versions).

Click Start or Upgrade . Do not disconnect the USB cable until completion.

Open the tool on your PC.

The tool will detect your device. Load the official firmware file ( .pac or .mbn format) if required.