So I tried updating ICS builds using the guide found at Droid 4 Utility Updated - xda-developers and everything goes fine until I try and install the 213 ICS zip file in recovery. It keeps giving me a "signature cannot be verified" message. I have tried the process 3 times now and continue to get this message. I am also unable to revert back to .219 GB and am now stuck on a bootloop that leads to a grey screen. Any suggestions? I'm using a droid 2 global as backup and am camping so if you need me to provide more information it may be delayed. Sorry and any assistance or ideas with this would be greatly appreciated.