|IOS 9 Upgrade Process|
A. How to Update IOS 9 via OTA
This one method is quite easy yes, why? You do not need iTunes, iCloud or other additional tools (iFunBox or IExplore to Jailbreak iOS devices). But, my own rather suggest an update to IOS 9 using iTunes. Min Why? Yes because the update via iTunes it just wrote like fresh install so, if there is the possibility of a crash via OTA but rarely does. Who want to try this update via OTA can do the steps below.
Note: Jailbreak iOS device can not use this update method!