Release the button once the "Software Upgrading" progress bar appears on the screen.

Use a FAT32-formatted USB drive (8GB or 16GB recommended). Extract: Download and extract all parts of the rar file.

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 logo via the Service Menu by pressing Input + 2580 on your remote.

Press and hold the on the TV panel (not the remote) and plug in the power cord.

This download contains the (rar format). File Name: CV338H_A50_1920x1080_USB_Tested_part01.rar Installation Instructions (USB Method)