If you can’t wait for the fall 2013 iOS & Beta release date, you can download iOS Beta and install it on the iPhone and iPad right now. I should say it’s likely you can upgrade your current device because the new version of Apple’s mobile operating system, iOS & Beta, is compatible with most but not all previous-generation devices.
Disclaimer: Follow this guide at your own risk.Mobotalks Media will not be liable if your device or data gets damaged in any way during the process
FINDING UDID OF YOU PHONE
Step 1: First of all open iTunes on your computer
Step 2: Now Plug your device in via USB Cable
Step 3: Click the name of you device from left side Go to “Summary” tab
Step 4: There click on the text which says “Serial Number” and it will be change to Identifier.
Step 1: You should copy that Identifier as we need that in upcoming steps.
REGISTER YOUR UDID AS A DEVELOPER UDID
Step 1: Now you have to go to the iMZDL’s website.
Step 2: There in the text box under Device Details you have to paste the UDID.
Step 3: After that Select the UDID Registration for $8 and then Click One the “Next” Button.
Step 4: Go here and after selecting the iOS 7 firmware for your specific device,
download it: iPhone 5 CDMA
HOW TO INSTALL IOS 7 FIRMWARE
Step 1: Open iTunes and after that plug you iOS Device into your PC via USB Cable
Step 2: Now you have to Click on your iOS device in iTunes on the left side.
Step 3: Create Backup of your device by clicking on the Backup. Hold Option and click Check for Update.
Step 4: When the selector comes up, choose the IPSW file you downloaded earlier and click OK
When the installation completes choose the most recent backup to re-install all your apps and contacts.
iOS7 Beta Warnings
Officially Apple says there is no way to downgrade from the beta back to iOS 6.1.1, but because Apple still signs iOS 6.1.1 you should be able to downgrade if things go bad. If this is a big deal, wait a few days to make sure this is a possibility.
You will need to use a computer to upgrade to iOS 7. There is currently no over-the-air update available, so grab your cord and a computer.
This is a beta. Things may not work s you normally expect them too and some apps may not work at all. Keep this in mind before you try out iOS 7. Don’t leave negative app reviews if apps don’t work. This preview is in place for developers to make their apps work with iOS 7, not for the average user.
Make sure you backup before you try any of this.