Plug the power cord back in while continuing to hold the Power button until the standby light starts blinking or an "Upgrading" progress bar appears.
Once all parts are downloaded and extracted into a single file (usually named MstarUpgrade.bin or similar), the standard update process for this board type is: Download CV638H B50 3840x2160 MKL part5 rar
: You cannot extract the firmware using only "part5.rar." You must have all parts (Part 1 through Part 5) in the same folder to successfully combine and extract the final binary ( .bin ) or update file. Plug the power cord back in while continuing
The firmware contained in this RAR file is designed specifically for the CV638H-B50 Download CV638H B50 3840x2160 MKL part5 rar
