Did sbf work?
Correct me if I'm wrong... you said you upgraded to Jellybean... I was under the impression based of when people tried to downgrade from ics to gingerbead that trying to sbf down, would result in a permanent brick.
Locked bootloaders mean we can't touch some of the stuff fastbooting touches. I hate to be the grim reaper here, but without time to do some research, your phone is a goner.
Sent from my XT894 using Tapatalk 2
First, you should go into the safestrap boot menu and switch to the stock (unsafe) system. Once you're there, go into the safestrap app and uninstall recovery. Then uninstall the safestrap app. Then go into the settings menu and wipe internal sd card. Then boot into the stock bootloader and choose factory reset. Then reboot into recovery again and choose fastboot and start the sbf process. If all goes well then download and place theJB update file on your sd card, then go into recovery and choose the JB file and flash it.
Maybethe person who made the Droid4 utility can update it so it works similar to the way it did when we were jumping from leak to leak a few months go. From what I recall it would flash the ICS kernel and then everything else of GB and from there the ICS update would work.