same problem I am reading about where the iPhone
suddenly locked me out and will not accept a code- won't even respond to my entering the numbers. No idea what happened- have not changed any settings recently
JA: What OS X (Operating System, e.g. Sierra, El Capitan, Yosemite, etc.) or iOS are you runninng?
Customer: OS X El Capitan
JA: Have you installed any updates recently?
Customer: yes! and when the update was complete my iTunes library, maps and some other apps were gone
JA: What troubleshooting have you tried?
Customer: i have tried the hold sleep and home buttons until apple icon appears- I have done this a few times but the phone eventually goes back to the locked screen
JA: Anything else you want the Mac expert to know before I connect you?
Customer: I think that's it