Try using iFaith to dump the SHSH blobs off of your device. Fish out the iOS 6.0 blobs and create a custom IPSW and see if restoring that custom IPSW would work. Or if you have the iOS 6.0.1 blobs, use that.
-1 refers mainly to the baseband chipset problem, but can also be linked to other hardware problems. Make sure when you're restoring that you put your device into DFU mode. If possible, put the device into DFU mode and try restoring again using iTune's Shift+Click Restore function and point it to a clean IPSW downloaded off of this site or if you have the IPSW downloaded through iTunes, use that.