This is for:
HG50AT690U

1. Unzip the firmware archive and copy the Image folder to the USB flash memory stick (formatted as FAT32).
2. Enter the Hospitality Menu mode by pressing in consecutive order the buttons “Mute", "1", "1", "9", "Enter“ on your remote controller.
3. In the Hospitality Menu, navigate to System > SW Upgrade.
4. After the upgrade is completed successfully, you can verify the firmware version by pressing the red button on the remote controller and checking the firmware version that appears at the bottom of the screen.