: 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.
: 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
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.
Wait for a progress bar or "Software Updating" screen to appear, then release the button.
: Use a 4GB or 8GB USB drive formatted to FAT32 .