Originally Posted by ultravorx
Network is visible, using psk2 security with dual band. It also seems to be on all wifi networks.
Sent from my SM-N900T using Tapatalk 2
Okay. When you say PSK2, do you mean WPA2 Enterprise? I don't see a PSK2 option on my airport (and it's not that old!). Anyway, if the problem is on all wifi networks, and supposing this is not a hardware issue, have you made any modifications to the phone? Is the AT&T wifi Smart Wifi app in use (that app screws up wifi connections like it was built for it)? Does she have the battery saving option enabled? I would recommend disabling Smart Wifi and battery saving if they're enabled. Also, if she uses an alternative messaging app, she should disable its MMS capabilities. Sliding Messaging MMS tends to mess up wifi connections on my phone, for example.
By the way, if she has root, the update will crash. It will also fail to install if any stock apps have been removed. You should see threads here about how to install the update. Sideloading is also an option. You still need to have a full stock rom installed though. There is a safe root method for MK2 too.