Firmware for the StarTrack SRT-1015 HD 4K receiver, dated 29 April 2018, contained in a 6.53 MB RAR archive. It is used to restore the software when the box hangs at boot, behaves erratically or needs updating to this release. Unpack it and look for the image file and any notes on flashing, typically via USB. Verify the model label before installing, since images for other StarTrack models are not compatible, save the channel list and do not cut power mid-update.
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)