Official Apple IOS Firmware Download Links for iPhone:

iPad firmware

iPad2(wifi) (iPad2,1) 6.1 (10B141)
iPad2(at&t) (iPad2,2) 6.1 (10B141)
iPad2(vz) (iPad2,3) 6.1 (10B141)
iPad2,4 (iPad2,4) 6.1 (10B141)
iPad2,5 (iPad2,5) 6.1 (10B141)
iPad2,6 (iPad2,6) 6.1 (10B141)
iPad2,7 (iPad2,7) 6.1 (10B141)
iPad3,1 (iPad3,1) 6.1 (10B141)
iPad3,2 (iPad3,2) 6.1 (10B141)
iPad3,3 (iPad3,3) 6.1 (10B141)
iPad3,4 (iPad3,4) 6.1 (10B141)
iPad3,5 (iPad3,5) 6.1 (10B141)
iPad3,6 (iPad3,6) 6.1 (10B141)
iPhone firmware 
iPhone3GS (iPhone2,1) 6.1 (10B141)
iPhone4 (iPhone3,1) 6.1 (10B144)
iPhone3,2 (iPhone3,2) 6.1 (10B144)
iPhone4(vz) (iPhone3,3) 6.1 (10B141)
iPhone4S (iPhone4,1) 6.1 (10B142)
iPhone5,1 (iPhone5,1) 6.1 (10B143)
iPhone5,2 (iPhone5,2) 6.1 (10B143)

iPhone5
GSM
6.1.3 http://appldnld.apple.com/iOS6.1/…../iPhone5,1_6.1.3_10B329_Restore.ipsw
6.0 http://appldnld.apple.com/iOS6/Resto…5_Restore.ipsw
CDMA
6.1.3 http://appldnld.apple.com/iOS6.1/…./iPhone5,2_6.1.3_10B329_Restore.ipsw
6.0 http://appldnld.apple.com/iOS6/Resto…5_Restore.ipsw

iPhone4S
6.1.3 http://appldnld.apple.com/iOS6.1/……/iPhone4,1_6.1.3_10B329_Restore.ipsw
6.0 http://appldnld.apple.com/iOS6/Resto…3_Restore.ipsw
5.1.1 http://appldnld.apple.com/iOS5.1.1/0…6_Restore.ipsw
5.1 http://appldnld.apple.com/iOS5/041-1…9_Restore.ipsw
5.0.1 (9A406) http://appldnld.apple.com/iPhone4/04…6_Restore.ipsw
5.0.1 (9A405) http://appldnld.apple.com/iPhone4/04…5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04…4_Restore.ipsw

iPhone4
GSM
6.1.3 http://appldnld.apple.com/iOS6.1/…../iPhone3,1_6.1.3_10B329_Restore.ipsw
6.0 http://appldnld.apple.com/iOS6/Resto…3_Restore.ipsw
5.1.1r1 http://appldnld.apple.com/iOS5.1.1/0…8_Restore.ipsw
5.1.1 http://appldnld.apple.com/iOS5.1.1/0…6_Restore.ipsw
5.1 http://appldnld.apple.com/iOS5/041-1…6_Restore.ipsw
5.0.1 http://appldnld.apple.com/iPhone4/04…5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04…4_Restore.ipsw
4.3.5 http://appldnld.apple.com/iPhone4/04…1_Restore.ipsw
4.3.4 http://appldnld.apple.com/iPhone4/04…2_Restore.ipsw
4.3.3 http://appldnld.apple.com/iPhone4/04…2_Restore.ipsw
4.3.2 http://appldnld.apple.com/iPhone4/04…7_Restore.ipsw
4.3.1 http://appldnld.apple.com/iPhone4/04…4_Restore.ipsw
4.3 http://appldnld.apple.com/iPhone4/04…0_Restore.ipsw
4.2.1 http://appldnld.apple.com/iPhone4/06…8_Restore.ipsw
4.1 http://appldnld.apple.com/iPhone4/06…7_Restore.ipsw
4.0.2 http://appldnld.apple.com/iPhone4/06…0_Restore.ipsw
4.0.1 http://appldnld.apple.com/iPhone4/06…6_Restore.ipsw
4.0 http://appldnld.apple.com.edgesuite….3_Restore.ipsw

CDMA
6.1.3 http://appldnld.apple.com/iOS6.1/………./iPhone3,3_6.1.3_10B329_Restore.ipsw
6.0 http://appldnld.apple.com/iOS6/Resto…3_Restore.ipsw
5.1.1 http://appldnld.apple.com/iOS5.1.1/0…6_Restore.ipsw
5.1 http://appldnld.apple.com/iOS5/041-1…6_Restore.ipsw
5.0.1 http://appldnld.apple.com/iPhone4/04…5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04…4_Restore.ipsw
4.2.10 http://appldnld.apple.com/iPhone4/04…0_Restore.ipsw
4.2.9 http://appldnld.apple.com/iPhone4/04…1_Restore.ipsw
4.2.8 http://appldnld.apple.com/iPhone4/04…1_Restore.ipsw
4.2.7 http://appldnld.apple.com/iPhone4/04…3_Restore.ipsw
4.2.6 http://appldnld.apple.com/iPhone4/04…0_Restore.ipsw

iPhone3GS
6.1.3 http://appldnld.apple.com/iOS6.1/……./iPhone2,1_6.1.3_10B329_Restore.ipsw
6.0 http://appldnld.apple.com/iOS6/Resto…3_Restore.ipsw
5.1.1 http://appldnld.apple.com/iOS5.1.1/0…6_Restore.ipsw
5.1 http://appldnld.apple.com/iOS5/041-1…6_Restore.ipsw
5.0.1 http://appldnld.apple.com/iPhone4/04…5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04…4_Restore.ipsw
4.3.5 http://appldnld.apple.com/iPhone4/04…1_Restore.ipsw
4.3.4 http://appldnld.apple.com/iPhone4/04…2_Restore.ipsw
4.3.3 http://appldnld.apple.com/iPhone4/04…2_Restore.ipsw
4.3.2 http://appldnld.apple.com/iPhone4/04…7_Restore.ipsw
4.3.1 http://appldnld.apple.com/iPhone4/04…4_Restore.ipsw
4.3 http://appldnld.apple.com/iPhone4/04…0_Restore.ipsw
4.2.1 http://appldnld.apple.com/iPhone4/06…a_Restore.ipsw
4.1 http://appldnld.apple.com/iPhone4/06…7_Restore.ipsw
4.0.2 http://appldnld.apple.com/iPhone4/06…0_Restore.ipsw
4.0.1 http://appldnld.apple.com/iPhone4/06…6_Restore.ipsw
4.0 http://appldnld.apple.com.edgesuite….3_Restore.ipsw
3.1.3 http://appldnld.apple.com.edgesuite….8_Restore.ipsw
3.1.2 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
3.1 http://appldnld.apple.com.edgesuite….4_Restore.ipsw
3.0.1 http://appldnld.apple.com.edgesuite….0_Restore.ipsw
3.0 http://appldnld.apple.com.edgesuite….1_Restore.ipsw

iPhone3G
4.2.1 http://appldnld.apple.com/iPhone4/06…8_Restore.ipsw
4.1 http://appldnld.apple.com/iPhone4/06…7_Restore.ipsw
4.0.2 http://appldnld.apple.com/iPhone4/06…0_Restore.ipsw
4.0.1 http://appldnld.apple.com/iPhone4/06…6_Restore.ipsw
4.0 http://appldnld.apple.com.edgesuite….3_Restore.ipsw
3.1.3 http://appldnld.apple.com.edgesuite….8_Restore.ipsw
3.1.2 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
3.1 http://appldnld.apple.com.edgesuite….4_Restore.ipsw
3.0.1 http://appldnld.apple.com.edgesuite….0_Restore.ipsw
3.0 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
2.2.1 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
2.2 http://appldnld.apple.com.edgesuite….7_Restore.ipsw
2.1 http://appldnld.apple.com.edgesuite….6_Restore.ipsw
2.0.2 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
2.0.1 http://appldnld.apple.com.edgesuite….8_Restore.ipsw
2.0 http://appldnld.apple.com.edgesuite….7_Restore.ipsw

iPhone (Original)
3.1.3 http://appldnld.apple.com.edgesuite….8_Restore.ipsw
3.1.2 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
3.1 http://appldnld.apple.com.edgesuite….4_Restore.ipsw
3.0.1 http://appldnld.apple.com.edgesuite….0_Restore.ipsw
3.0 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
2.2.1 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
2.2 http://appldnld.apple.com.edgesuite….7_Restore.ipsw
2.1 http://appldnld.apple.com.edgesuite….6_Restore.ipsw
2.0.2 http://appldnld.apple.com.edgesuite….1_Restore.ipsw
2.0.1 http://appldnld.apple.com.edgesuite….8_Restore.ipsw
2.0 http://appldnld.apple.com.edgesuite….7_Restore.ipsw
1.1.4 http://appldnld.apple.com.edgesuite….2_Restore.ipsw
1.1.3 http://appldnld.apple.com.edgesuite….3_Restore.ipsw
1.1.2 http://appldnld.apple.com.edgesuite….b_Restore.ipsw
1.1.1 http://appldnld.apple.com.edgesuite….a_Restore.ipsw
1.0.2 http://appldnld.apple.com.edgesuite….8_Restore.ipsw
1.0.1 http://appldnld.apple.com.edgesuite….5_Restore.ipsw
1.0.0 http://appldnld.apple.com.edgesuite….a_Restore.ipsw