How to downgrade to iOS 9 if you don't like iOS 10

THERE ARE A lot of reasons as to why you may want to revert to iOS 9 after installing iOS 10. It’s not difficult to revert, but you need to do it sooner than later. Each version of iOS is signed (approved) by Apple. When iOS updates are released, the previous version remains signed for a short period of time. Eventually, Apple stops signing the previous version, which prevents you from installing the old version.

- Roman Loyola

Here’s how to revert back to iOS 9.

Find the .ipsw file

First, you need to find a file called [iOS device].ipsw. If you are downgrading an iPhone, the file will have a name like, “iPhone8,2_9.3.5_13G36_Restore.ipsw”. Here’s how to find it.

1. In the Finder, hold down the Option key and select Go > Library. (The Library folder is usually invisible in your Home folder. If you don’t hold down the Option key, the Library selection will not be available.)

2. Open the iTunes folder.

3. Look for a Software Updates folder that corresponds to your device. So for the iPhone, look for iPhone Software Updates and open it.