Receiver firmware for the SuperMax MINI PLUS, version V1.55 dated 4 January 2016 according to the name. Packed as a 512 KB rar archive, it likely holds an image sized for a 4 Mbit flash chip. Repair shops use such files to revive satellite boxes stuck on a boot message or with a dead display, either through the USB or RS-232 upgrade routine or by programming the SPI flash off board. Make sure the hardware really is the MINI PLUS model, and save the original flash contents before overwriting them.
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 @biosarchive. 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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →