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.

How To Downgrade from iOS 7 Back To iOS 6 The Easy Way

Upgrading to iOS 7 is a pretty painless process. All that's required is an Apple Developer account and the time it takes to download the install file. Going back, however, isn't quite so easy. 

Step 1: Download The Proper iOS 6 File

In order to install iOS 6, you must pick the proper version or iTunes will spit an error back at you. For the iPhone 5, you must download iOS 6.1.4. For everything else, it is iOS 6.1.3. If you use the wrong file for your device, iTunes will not allow you to restore it.

• For iPhone 5, download iOS 6.1.4. Depending on what cellular carrier you use, you will have to download a different version of iOS 6. Make sure you get the proper one for your network: GSM for AT&T and T-Mobile customers and CDMA for Verizon and Sprint. More info and a full list of worldwide carriers here. 
• For iPhone 4/4S & iPod Touch 5: download iOS 6.1.3. 

Step 2: Plug The Device Into Your Computer, Cancel The iTunes Automatic Sync Process (If It Starts)

Step 3: Do Not Put Your Device Into DFU Mode, Just Hit Restore

A Special Case: iTunes Error 3194 (download this script)

How To Download And Install Apple's iOS 7 Beta

About this time every year, Apple gives a gift to mobile developers: the newest version of iOS. Developers then have most of the summer to play with the beta version and ready their apps for the full release of the operating system when the new iPhone is launched later in the year.

This year Apple has announced iOS 7—and it is a dramatic new release of Apple’s core mobile operating system with a new look and a treasure trove of new functions.

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.