Its an old 8GB class 4 MicroSD, formatted to FAT32. Usually on older stuff you want to try to stay 32GB and below or atleast make sure its FAT32, sometimes it'll default to NTFS or ExFAT.

Actually one key part, which I totally forgot about, I just blinded did it when at like 6:30am before going racing for the day The files need to be a folder called 'Firmware' I'd imagine this is the key. I'll update any posts above to save confusion.