Hi Jesus,
I've never had the problem you described, but if you think dBUG has been corrupted
there are instructions for recovering included with the LTIB release.
In the original iso in the <mount>/Help/hardware/CFFlasher/ directory are prebuilt
bootloaders and the software necessary to recover dBUG. The README.txt has
instructions. This will also reset all the dBUG "set" values.
Regards,
Matt