I think posting here is likely to be my best shot at finding someone with this firmware.
I'm after an unbranded stock version of this firmware (R4515_G_08.BD.D3R) If someone could link me to an actual working link, or perhaps re-host the file themselves and then link directly to that - It would be a fantastic help.
I've spent the best part of 4/5 hours this evening going through false links, broken links, and corrupt Rar files..