This is the most common error. You get a message saying "No update file detected" or "Invalid image." Here is the diagnostic checklist:
Manufacturers release these files to fix bugs, add features, or update the Android OS. System Recovery: mstarupgrade.bin
Developers sometimes binary-patch these files to enable UART consoles or add SSH support to locked-down hardware. This is the most common error
Insert the USB drive into the TV's USB port (preferably a USB 2.0 port). mstarupgrade.bin
Search for your model + "firmware."