Apple iOS 7 Installation Guide
1. Download the iOS 7 Beta file for your specific iPhone model off Apple’s website. We’ve listed the direct links to the iOS 7 download pages below, so find the right model and download away — just remember, you need to be an Apple developer or pay that $99 registration fee.
Developers and users who have paid the $99 fee will need to log in with their information to access the download files for iOS 7 And if you dont have the account go to How to Download and Install iOS 7 IPSW Without Developer Account or UDID. Once downloaded, the file you download will show up on IMZDL, but it could take a little time.