Apple released iOS 5.1 update to general public which is compatible with iPhone 4S, iPhone 4, iPhone 3GS, iPad 2, original iPad, , iPod Touch 4G and iPod Touch 3G. You can find direct iOS 5.1 download links after the break.
Warning: Users who rely on jailbreak or unlock must stay away from iOS 5.1 update even if they have saved SHSH blobs for A5 iDevices previously.
Download iOS 5.1 for iPhone
iOS 5.1 for iPhone 4S
iPhone4,1_5.1_9B179_Restore.ipsw
iOS 5.1 for iPhone 4
iPhone3,1_5.1_9B176_Restore.ipsw [GSM]
iPhone3,3_5.1_9B176_Restore.ipsw [CDMA]
iOS 5.1 for iPhone 3GS
iPhone3,1_5.1_9B176_Restore.ipsw
Download iOS 5.1 for iPad
iOS 5.1 for The New iPad 3
iPad3,1_5.1_9B176_Restore.ipsw [WiFi]
iPad3,2_5.1_9B176_Restore.ipsw [GSM]
iPad3,3_5.1_9B176_Restore.ipsw [CDMA]
iOS 5.1 for iPad 2
iPad2,1_5.1_9B176_Restore.ipsw [WiFi]
iPad2,2_5.1_9B176_Restore.ipsw [GSM]
iPad2,3_5.1_9B176_Restore.ipsw [CDMA]
iOS 5.1 for iPad 1
iPad3,1_5.1_9B176_Restore.ipsw
Download iOS 5.1 for iPod Touch
iOS 5.1 for iPod Touch 4G
iPod4,1_5.1_9B176_Restore.ipsw
iOS 5.1 for iPod Touch 3G
iPod3,1_5.1_9B176_Restore.ipsw