It downgraded my ios to 5.0.1 but my bb stayed at 04.12.01, how do i now downgrade solely my bb ? Thanks

Pretty sure I know the answer and I have to wait for a new release, but thought I would throw it out there anyway. I have an iphone 4 ios 5.1 bb 04.12.01, i've installed redsn0w and ultrasn0w (edit) but having problems with "no service". The phone recognizes the sim is locked and needs a PIN but other than that not getting anything other than no service. Any advice ?! Thanks