when you run unrevoked 3,it immediately boots your phone into fastboot. im not sure if its still using the "rage against the cage" method of rooting the OS,then adding recovery,then flashing its forever tool, or if now is turning the radio secure flag off first thing,then flashing the recovery,then adding the SU files. if its turning the secure flag off first,it may still work with GB. even if the 2nd part of it fails(where it adds root files),it might still work to get the phone to an s-off status. has anyone thats s-on,GB OTAed,tried it?