I had Gummyjar 2.5 on my Droid X. I tried to SBF the phone back to stock(I've done SBF before but not with Gummyjar) and it seemed to work but the phone will not boot.
The only screen it goes to is a black screen with white text that reads:
Bootloader
30.04
Err: A5,70,70,00,1F
MEM_MAP...