How To Install Apple's iOS 7 Beta in iPhone 3GS

How do you get started with iOS 7? Below are the basics of what you will need to know to load the new iOS and get started building apps.

1. On your Mac, go to the iOS Development Center and download the appropriate version of the iOS 7 beta. This will take a few minutes.
2. Open the .dmg file and find the .ipsw file. It should be the only one there in your download file of iOS 7, so it is impossible to miss.
3. Connect your developer device to your computer and launch iTunes.
4. Click on the iPhone button in iTunes. This will bring up your stats (such as memory use and serial numbers). Go ahead and back up your phone to iTunes now if you haven’t done it already.
5. Press the option button when restoring in iTunes. A window will open where you can choose the iOS 7 beta .ipsw file.
6. Download it (which will take about 10 minutes).
7. Wait patiently.