Looks like this can only be done legitimately now. I removed cache and it wouldn't let me play the full version of the game without connecting to xBox live, and as soon as I did it required the update or it would disconnect me.
Either way though, put it on easy and learn the routine and you can beat this without a continue after a little practice. Took me 45 minutes of practice. The biggest part for me was getting past the first part of the final boss only losing 2 lives, I was set after that.
Another hint, before advancing into the room against the boss, keep shooting the fleeing enemies until you get a weapon upgrade. Then advance into the room with the boss. This will allow you to put some big hurt on the boss right off the bat.