Yeah, that would have been too easy...
But just to be clear, the jaibreak update failed with a 0003 error? And I guess any other hack failed with a U007?
Anyway, last shot in the dark, I updated (again!

) the files in the first post... You're welcome to try these new ones, but I doubt it'll work...

.
Also, just to be sure, what's the beginning of the serial number? (it was B005 on a KDX for example).