Well I ruled out the reboot crash issue. I just can't get NVRAM to save for some reason. Pretty friggin' annoying.
Good to see a success story. Did you just do the ROM and MLB values or did you use the serial number too?
First time i have copied all the values, but then i've made a try first exiting imessage, then change the serial number to the one i had before. Made a reboot and then re-enter with my icloud account. all works.