: Release the button once the "Software Upgrading" or "Do not power off" progress bar appears on the screen.
The is a common motherboard used in several 4K Smart TV models, including those from Condor and Hyundai. Using the exact firmware matched to this board ID is essential; installing the wrong version can lead to hardware incompatibility, such as the TV failing to boot or failing to recognize USB devices. How to Download and Prepare the Firmware : Release the button once the "Software Upgrading"
: Plug the drive into the USB 2.0 port of the TV (often marked in white or black, rather than the blue USB 3.0 port). : Release the button once the "Software Upgrading"