How to unlock my pass code locked iphone 4 after ios 6.0 update?

I just backed up my old phone info onto my iphone 4 after updating it to the ios 6.0, and i don't remember my old pass code. The old method of holding the lock and home button then plugging into my computer doesn't seem to wok after ios 6.0, if there's a new trick i would really appreciate it. I have priceless photos and video, memories id really not like to lose. And thanks for any help!

You should have thought about that before doing that…