When your TV is unresponsive, a standard System Update via the menu isn't an option. Instead, you need to "flash" the firmware using a USB drive.

: Large firmware files are often split into smaller "parts" to make downloading easier. You must download all parts (Part 1, 2, 3, and 4) into the same folder before extracting. Use a tool like WinRAR to unzip them. How to Install the Firmware

Press and hold the button on the TV itself (not the remote). While holding the button, plug the TV back in.

: The 35017861 firmware is designed for models with a 1920x1080 resolution panel. It fixes "boot loops" where the TV won't start past the loading screen.

Wait for a progress bar or "Software Updating" screen to appear, then release the button.

: Once it hits 100%, the TV should reboot automatically. Do not unplug the power during this process, as it can permanently damage the mainboard. Where to Find the Files?

: Once you extract the .rar files, copy the main firmware file (usually named MstarUpgrade.bin or similar) directly to the root of your USB drive—do not put it in a folder. The Flash Process : Turn off the TV and unplug it from the wall. Insert the USB drive into the TV's USB port.