Installing iOS on a Development Device
Install a new version of iOS when you want to upgrade a device for development.
Launch iTunes on your Mac.
Connect your iOS device to your Mac.
In the upper-right corner, select the iOS device.
To upgrade to the latest iOS version, click the Restore iPhone/iPad/iPod button.
To install a beta version of iOS, Option-click the Restore iPhone/iPad/iPod button, select the iOS beta software restore image, and click Open.
The software restore image file has a
When installation is complete, activate the iOS device and use iTunes to restore its contents.