Software package marked T22 Flower, version 1.85, built on 14 March 2013 according to the date string in the name, stored as a 1.67 MB RAR archive. The name does not identify the receiver brand, so make sure the target device really is a T22 Flower model before flashing. Packages like this are usually loaded through USB or RS-232 with a loader utility, or written to the flash chip with a programmer when the box will not boot. Keep a copy of the original image so the receiver can be returned to its earlier state.
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.