You can often change the resolution or boot logo via the Service Menu by pressing Input + 2580 on your remote.
Do not power off the TV during the update process, as this can permanently brick the motherboard. Download Link [Insert Your Link Here] Download CV338H A50 1920x1080 USB Tested part01 rar
Place the firmware file (often allupgrade_338_xxx.bin or similar) into the root directory of the USB—do not put it inside any folder. Update: Power off the TV. Insert the USB drive into the TV's USB port. You can often change the resolution or boot