I have a friend that wants me to jailbreak her phone. she is running 5.0.1 and i used redsn0w and it went thru the whole process and when it said done and the phone restarted i plugged from computer and cydia was no where to be found. I was scared to retry to jailbreak bc it isnt my phone and i dont have access to her computer that she is backed up to. What caused this and is it safe to try to rejailbreak?