The CV338H-A42 is a popular universal Android TV control board integrated with a power supply and LED driver. It is commonly used to repair or upgrade 32" to 42" LED TVs in the Asia-Pacific and India markets.
Press and hold the on the TV panel (not the remote).
Format a USB flash drive (8GB or less is recommended) to FAT32 .
If you have the full extracted firmware, follow these steps to update your board:
Plug the TV back into the power outlet while continuing to hold the Power button.
Firmware files for these boards are often large (over 300MB) and are split into multiple parts (part1, part2, part3) by technicians on repair forums like Televid-Sib to meet upload limits.