Software release 1.1.92 for the HD BOX S500 satellite receiver, dated 26.03.17 and delivered as a 4.58 MB RAR archive. It is newer than the 1.1.80 build and is commonly used to fix boot loops, frozen logos or menu faults after a corrupted update. Extract it with WinRAR or 7-Zip and flash it with the standard update procedure or a serial loader. Confirm that the receiver really is an HD BOX S500 with the matching board, and keep a copy of the current firmware so the change can be reversed.
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.