I updated my ipad from ios6 to ios7. I noticed a really ridiculous thing after i updated my IPAD. The thing is after starting my device with ios7, i tried to enter my pass on the lock screen, but no way.
My old password consisted characters such as ¥ $# etc ... the keyboard layout is changed in ios7 and I couldn't see the "¥" sign anymore. I tried to restore it but I do need the lock pass.