Apple Mobile upgrade iOS9 failure Troubleshooting tutorial

　　IOS 9 Installation Failure Solution:

　　method One: go to Apple website to download complete installation image (need developer account);

　　Method Two: OTA upgrade iOS 9 error, you can choose to download iOS 9 firmware, and then upgrade via itunes;

　　method Three: check the mobile phone's wi-fi/mobile network is connected to normal, and then try several times (because Apple has just updated the iOS system when a large number of users are simultaneously upgrading, so the connection speed will be affected);

Well, the above is about iOS9 upgrade failed solution, in fact, is the network instability, OTA upgrade failed to use the computer upgrade two solutions are most practical.