iPhone has become an important part for many people in the world. As it has a lot of features inbuilt in it. Using this phone, you can save the contacts, photos, videos, access internet and many more. This device also helps you to get a lot of information and save them on your phone. In order to make your phone work in a better way, iOS constantly releases the updates, and also gives the option of upgrading the iOS software. Many people update their iPhone to higher iOS version. Currently, iOS 9 is the latest version. Generally, the newer versions of iOS have a lot of advanced features than its previous version. But after upgrading your phone, you might face some problems due to the compatibility issue with the iPhone. Or after few days, you may start facing the problems with your phone. In such cases, it is always better to downgrade your iOS 9, which would make your phone work in a proper way. In doing so, there are chances that you may lose the data, so you should always keep a backup of the data.