Why can't I upgrade iOS8 on the phone
Because the iOS8 system is still only beta version not to the official version, so the official temporarily did not push iOS8 OTA online upgrade.
IPad Air Upgrade iOS8 BETA5 Tutorial
1. We first Baidu to search to download a iOS8 Beta5, but to see whether the ipad Air version of the
2. And then connect the ipad Air to the computer.
3. Also open the computer's itunes software, in the itunes interface if the display connected to the computer successfully, we can press the computer Shift (up button) + left mouse button click on itunes Update restore function (figure)
4. A dialog box pops up when you press this key, and then we click "Click Update" to wait for itunes to run.
5. Finally, we just click on the update after the wait on the OH.
Friendly tips, before updating the best look at the following operating methods, that is, you need to back up your ipad Air data oh, otherwise may be lost data.