To make it sure you have to try it by yourself. The crisis recovery procedure seems to work at any case. (if something went wrong). So no need to wory about getting a bricked board. I don't know if it is necessary to flash the mod before by using the crisis recovery procedure. It could be. I would try it like Haxxa did. You may PM him to ask if it is necessary. AFAIK sp1 v668 doesn't kill activation.