Download all RAR parts. Right-click "part1.rar" and select "Extract Here" (this automatically pulls data from the other parts).
This community often shares All Resolution Upgrades Download CV338H U42 1366x768 ZEPHIR part1 rar
Press and hold the button on the TV while plugging it back in. Download all RAR parts
Place the extracted firmware file (usually named allinstall.bin or similar) in the root directory of the USB. Flash: Turn off the TV and unplug it. Insert the USB. Download CV338H U42 1366x768 ZEPHIR part1 rar