Why? You can restore a 4.1.2 backup, get S-off from a working system and do what you want with the phone.
Edit: Sorry, my bad. 4.1.2 will not boot because of your hboot. So yes, you are right, you need a 4.2.2 backup.
Last edited by old.splatterhand; 25th May 2014 at 07:21 PM.