The firmware for 1920x1080 resolution (Full HD) is typically available as a USB-updatable software used for various smart LED TV motherboards that utilize a Samsung remote or panel settings.
While a single "part 5" link is often part of a larger set on specific community forums, you can find the complete firmware or related archives at these repositories: : Offers a dedicated thread for TP.MS338.PC822 USB Firmware including a direct Google Drive link.
: Specialized firmware portals like Software-Eshop often list compatible firmware for GVC Pro and other brands using this board.
: A common source for China-made LED TV board software, including the MS338 series for various resolutions.
When downloading multi-part RAR files, ensure you have all parts (Part 1, Part 2, etc.) in the same folder before extracting. Extracting only "part 5" will result in an error as the archive is incomplete without the preceding segments.