While holding the button, plug the TV back into the power outlet.
: Another common resource for Chinese mainboard firmware. Check their MStar board archives. How to "Create a Solid Feature" (Combine and Extract) Download MSD6A348 T8C2 1920x1080 Noa Vision part03 rar
Release the button once the "Software Upgrading" or a progress bar appears on the screen. While holding the button, plug the TV back