These are the supported devices of iOS 7
iPod 5th Gen
Instruction how to update your iDevices to iOS 7
iPhone must be iOS 6.1.3
FACTORY Unlock or GLOBE and SMART lock
Step 1. Download the files of your iDevices
iPad mini (Model A1432)
iPad mini (Model A1454)
iPad mini (Model A1455)
iPhone 5 (Model A1428)
iPhone 5 (Model A1429)
iPhone 4 (GSM)
iPhone 4s (GSM)
iPad 2 WiFi (Rev A)
iPad 2 WiFi (Click Me)
iPad 2 WiFi + 3G (GSM)
iPad 3 WiFi (Click Me)
iPad 4 (Model A1458)
iPad 4 (Model A1459)
iPad 4 (Model A1460)
iPod 5th Gen (Click Me)
Save the file to your desktop, If you downloaded the DMG file just extract the IPSW just follow this steps CLICK ME FOR THE STEPS.
Step 2. Connect your iDevice to the PC and lunch the iTunes.
Step 3. Backup your iDevice to iCloud or in your PC.
Step 4. Press Shift Key and Left Click on your mouse the Check Update and this time the iTunes will allow you to choose the iOS you want to install, Then choose the file you downloaded in your desktop.
Step 5. Wait and See and Congrats.
Note: DO NOT UPDATE YOUR iDEVICES TO iOS 7 BETA 3