之前用的某网站提供的分流链接结果一直卡99.9%，这里po一下官方的下载链接，建议用迅雷或者QQ旋风离线下载。
iPhone 3GS
http://appldnld.apple.com/iPhone4/041-8356.20111012.SQRDT/iPhone2,1_5.0_9A334_Restore.ipsw
iPhone 4（GMS）
http://appldnld.apple.com/iPhone4/041-8358.20111012.FFc34/iPhone3,1_5.0_9A334_Restore.ipsw
iPhone 4（CDMA）
http://appldnld.apple.com/iPhone4/041-9743.20111012.vjhfp/iPhone3,3_5.0_9A334_Restore.ipsw
iPhone 4S
http://appldnld.apple.com/iPhone4/041-1317.20111012.UVTgr/iPhone4,1_5.0_9A334_Restore.ipsw
iPod Touch 3
http://appldnld.apple.com/iPhone4/061-8360.20111012.New3w/iPod3,1_5.0_9A334_Restore.ipsw
iPod Touch 4
http://appldnld.apple.com/iPhone4/061-9622.20111012.Evry3/iPod4,1_5.0_9A334_Restore.ipsw
iPad 1
http://appldnld.apple.com/iPhone4/041-8357.20111012.DTOrM/iPad1,1_5.0_9A334_Restore.ipsw
iPad 2 Wifi
http://appldnld.apple.com/iPhone4/041-9618.20111012.Zxb22/iPad2,1_5.0_9A334_Restore.ipsw
iPad 2 3G
http://appldnld.apple.com/iPhone4/041-9619.20111012.y34Nx/iPad2,2_5.0_9A334_Restore.ipsw
iPad 2 CDMA
http://appldnld.apple.com/iPhone4/041-9620.20111012.pnB4r/iPad2,3_5.0_9A334_Restore.ipsw