Extract the first part using WinRAR or 7-Zip ; this will automatically merge all parts into a single folder containing the .bin or image file.
To download the firmware (specifically part 3 of a multi-part archive), you can access specialized firmware repositories like CFirmware or KenotronTV . Firmware Details Main Board: TP.MS338.PC821 Resolution: 1920x1080 (Full HD) Storage Type: eMMC (typically 4GB)
If the TV is stuck on a logo or has a corrupted bootloader, you may need an eMMC programmer like the RT809F or RT809H to write the data directly to the eMMC chip. CFirmware: Lists the NIKAI TP.MS338.PC821 EMMC version.
Download all parts of the firmware (e.g., part1, part2, and part3).
Copy the file to the root of the USB drive and insert it into the TV while powered off. Turn the TV on to trigger the update.