iOS 5 Direct Download and Install
iOS 5 is now available for last two generation of Apple iPhone, iPad and iPod Touch. You can download and install iOS 5 to you iOS device using the Standalone iOS 5 IPSW file.
Download the latest iOS 5 IPSW file directly from Apple server and install it using iTunes 10.5 to your iPhone, iPod Touch or iPad by following these steps:
1. Download the iOS 5 for your device.
Download iOS 5 for iPhone 4 (GSM) | iPhone 4 (CDMA) | iPhone 3GS
Download iOS 5 for iPad 2 WiFi | iPad 2 GSM | iPad 2 CDMA
Download iOS 5 for iPod touch 4G | iPod touch 3G
2. Connect your iPhone (iOS devise) to your computer.
3. When iTunes opens, select your iPhone under Devices in the Source List on the left.
4. OPTION-click (on Macs) or SHIFT-click (on Windows) on the Update button in iTunes.
5. Now you will be able to tell iTunes to use the IPSW file you downloaded to update your iPhone, iPod Touch, iPad.
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iTunes 10.5 Download for Mac OS
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How to Update iOS