Loading service books on 7510 - I am stuck

I do have a question about the 7510 ONLY, NOT the 7520. They are different (OS 4.0 vs 4.1).

Loading service books... I have been a BES admin for many years and feel a bit lame asking about this... I cannot for the life of me figure out how to hand load a service book on the 7510 since ALT+SBEB (legacy SB restore) is for OS 4.1 devices and up.

The reason I ask is, I have a 6510, 7510, 7520, 7100i and my current NEXTEL 8350i.

My 8530i of couse is on NEXTEL with full BES (being a BES admin, naturally I run BESX at home with my personal device). The others are used for when friends and family come down from Canada. So they have active Boost SIMs in them. The 7510 and 6510 are the only devices I cannot get the desktop manager to load service books onto (by design, I understand this) as they are OS 4.0 not 4.1.

Can anyone give me a hint? I have searched 3 days for this.

EDIT: I have found that Desktop Manager 4.2.0 can upload service books for 4.0 devices... Now my issue is finding 4.0 usable service books since they changed with 4.1 and cannot be loaded. Magic Book editing hasn't helped me very much yet either.