Here are the clues he's given me:
3647665F635404A4 (he also said I would need this: 12+34)
other than that I have no idea what this means, or how to figure it out.
If anyone could help me out with this it would be awesome. I've never actually cracked one of these before but really want to crack this one.
EDIT: He told me this: double double backwards transpositions 16 to 64 (I think, he won't repeat it out loud any more)