Connect your EMMC programmer to the ISP pins on the CV638H board or desolder the EMMC chip. You can find the CV638H-D50 EMMC Pinouts on specialized repair forums like Remont-Main .
[Download] CV638H-D50 UHD ELEKTA EMMC Backup Dump File (Tested) Download CV638H UHD ELEKTA EMMC Backup part09 rar
Flashing EMMC firmware is a high-risk procedure. Incorrect files or power failure during the process can permanently damage your mainboard. Proceed only if you have the proper hardware and experience. Connect your EMMC programmer to the ISP pins
You can find various versions of this firmware and EMMC dumps on community-driven repair sites: Download CV638H UHD ELEKTA EMMC Backup part09 rar
Recovery from soft-brick, logo hang, or EMMC replacement. How to Use this Backup