This looks like a specific firmware or recovery file part for a high-resolution display (3840x2160), likely for a television or monitor board.

If you need a for a specific social media app (like Instagram or X)

Firmware Download: MS638 PC821 (3840x2160) USB Update – Part 01 Body: Hello everyone,Sharing the first part of the USB recovery firmware for the MS638 PC821 board. This is the 3840x2160 (4K) resolution version, reference REF45 .