RAR archive with firmware for the SR-T30 PRO receiver, Jordan2 variant, version V131 dated 17 November 2021, about 5.60 MB. The Jordan2 tag separates it from a parallel Jordan1 build, so pick the variant that matches the unit. Extract the archive and check its contents, which may include the image and loader notes. Before flashing via USB or a programmer, verify the board type and back up the current flash, because a wrong variant can leave the receiver unable to boot.
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.