Just to confirm, yes I was sending 6D all along but it definitely doesn't work. I've tried Yamaha Support and they initally sent me SYSEX messages to transmit which was exactly what I had been sending (but with the original 5C) code. So even they seem to be confused.
I just really want to hear/see someone pull this off to know if it's possible! Otherwise it seems like the manual may have just taken this SYSEX info from the AN1X and forgot to edit it.
Which is really crap ![](\"https://ec.yimg.com/ec?url=https%3A%2F%2Fs.yimg.com%2Fok%2Fu%2Fassets%2Fimg%2Femoticons%2Femo37.gif&t=1574119659&sig=eF74N0NR3aKA983Zx8jPiw--~E\")