While specific download links for "part5" often disappear due to site maintenance, you can check these common repositories:
SAMIX (Often used in Asia-Pacific and Middle Eastern markets). How to Use the Downloaded Parts Download CV338H A50 1920x1080 512M SAMIX part5 rar
The file string you provided refers to a critical firmware update for the CV338H-A50 While specific download links for "part5" often disappear