I just updated my Mac Book Pro Mid 2012 to Yosemite. This worked out fine, but now iTunes wont let me update my iPhone 5. I loaded the newest OS, but it always stops saying Error Number 4013. The Phone now remains in maintenance State and stays useless in this state:-( I tried a different cable, I tried restart, I disconnected other usb devices, now I'm at the end of my knowledge... Anyone now what I could do?