Firmware archive for a StarTrak Platinum receiver, marked KDP8005 and 150309 with a 3G note, packed as a 6.91 MB RAR. KDP8005 is likely a board or platform code and 150309 possibly a build date, though the name does not confirm it. Such files are used to restore receivers after flash corruption or to load a specific software build. Check the markings on the main board against the KDP8005 reference and back up the existing firmware before flashing anything.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @tvsoftwareworld. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)