Since multipart RAR files are often hosted on cloud drives by independent technicians, you may find the required part or a complete alternative at the following locations:
: Detailed firmware files, including EMMC read/write files and USB update packages, are often shared on platforms like Advance Electronics or Electro-Support . Download MS638 PC822 3840x2160 REF55 part5 rar
: A known firmware link for this board (though version compatibility should be verified) is hosted on Google Drive. Important Precautions Since multipart RAR files are often hosted on
Searching for the specific "part5.rar" file for the MS638 PC822 : Ensure the firmware matches your 3840x2160 resolution
: Tutorials on troubleshooting "Stuck on Logo" issues for this board often include download links in the descriptions on YouTube .
: Ensure the firmware matches your 3840x2160 resolution. Installing firmware for a different resolution (like 1080p) can result in a distorted or "mirrored" image.