This looks like a specific firmware or recovery file part for a high-resolution display (3840x2160), likely for a television or monitor board.
The where you're posting (e.g., Telegram, a repair forum, a personal blog)
Fixing a 4K TV? MS638 PC821 Firmware Part 01 is here! 🛠️ Body: If you're working on a repair for a unit using the MS638 PC821 motherboard, I’ve just uploaded Part 01 of the USB update files. This specific set is for the 4K REF45 configuration.