Your USB drive might be too large or incorrectly formatted. Try using an older, smaller USB 2.0 drive (4GB or 8GB) and double-check that it is formatted to FAT32.
If your TV still boots, use a specialized tool or technician menu to back up your current "dump" file to a USB drive before rewriting the memory. mstar android tv firmware download
Turn off the TV completely and .
: A popular script for unpacking and repacking MStar firmware images, available on GitHub. Your USB drive might be too large or incorrectly formatted
Plug the USB flash drive into the USB 1.0/2.0 slot of the TV (usually color-coded black, not blue). Avoid ports labeled "Service" unless specified by the firmware notes. Trigger the Bootloader Upgrade: mstar android tv firmware download