Here is the complete list of firmware download links for iPhone 4, 3GS, 3G and 2G. If you want to know the current version of iOS firmware installed on your iPhone then Tap Setting > General > About > Version on your iPhone.

Download iPhone 4 Firmware

iOS 4.3.3 : iPhone3,1_4.3.3_8J2_Restore.ipsw

iOS 4.3.2 : iPhone3,1_4.3.2_8H7_Restore.ipsw

iOS 4.3 : iPhone3,1_4.3_8F190_Restore.ipsw

iOS 4.2.1 : iPhone3,1_4.2.1_8C148_Restore.ipsw

iOS 4.1 : iPhone3,1_4.1_8B117_Restore.ipsw

iOS 4.0.2 : iPhone3,1_4.0.2_8A400_Restore.ipsw

iOS 4.0.1 : iPhone3,1_4.0.1_8A306_Restore.ipsw

iOS 4.0.0 : iPhone3,1_4.0_8A293_Restore.ipsw

Download iPhone 3GS Firmware

iOS 4.3.3 : iPhone2,1_4.3.3_8J2_Restore.ipsw

iOS 4.3.2 : iPhone2,1_4.3.2_8H7_Restore.ipsw

iOS 4.3 : iPhone2,1_4.3_8F190_Restore.ipsw

iOS 4.2.1 : iPhone2,1_4.2.1_8C148a_Restore.ipsw

iOS 4.1 : iPhone2,1_4.1_8B117_Restore.ipsw

iOS 4.0.2 : iPhone2,1_4.0.2_8A400_Restore.ipsw

iOS 4.0.1 : iPhone2,1_4.0.1_8A306_Restore.ipsw

iOS 4.0.0 : iPhone2,1_4.0_8A293_Restore.ipsw

3.1.3 : iPhone2,1_3.1.3_7E18_Restore.ipsw

3.1.2 : iPhone2,1_3.1.2_7D11_Restore.ipsw

3.1.0 : iPhone2,1_3.1_7C144_Restore.ipsw

3.0.1 : iPhone2,1_3.0.1_7A400_Restore.ipsw

3.0.0 : iPhone2,1_3.0_7A341_Restore.ipsw

Download iPhone 3G Firmware

iOS 4.2.1 : iPhone1,2_4.2.1_8C148_Restore.ipsw

iOS 4.1 : iPhone1,2_4.1_8B117_Restore.ipsw

iOS 4.0.2 : iPhone1,2_4.0.2_8A400_Restore.ipsw

iOS 4.0.1 : iPhone1,2_4.0.1_8A306_Restore.ipsw

iOS 4.0.0 : iPhone1,2_4.0_8A293_Restore.ipsw

3.1.3 : iPhone1,2_3.1.3_7E18_Restore.ipsw

3.1.2 : iPhone1,2_3.1.2_7D11_Restore.ipsw

3.1.0 : iPhone1,2_3.1_7C144_Restore.ipsw

3.0.1 : iPhone1,2_3.0.1_7A400_Restore.ipsw

3.0.0 : iPhone1,2_3.0_7A341_Restore.ipsw

2.2.1 : iPhone1,2_2.2.1_5H11_Restore.ipsw

2.2.0 : iPhone1,2_2.2_5G77_Restore.ipsw

2.1.0 : iPhone1,2_2.1_5F136_Restore.ipsw

2.0.2 : iPhone1,2_2.0.2_5C1_Restore.ipsw

2.0.1 : iPhone1,2_2.0.1_5B108_Restore.ipsw

2.0.0 : iPhone1,2_2.0_5A347_Restore.ipsw

Download iPhone 2G Firmware

3.1.3 : iPhone1,1_3.1.3_7E18_Restore.ipsw

3.1.2 : iPhone1,1_3.1.2_7D11_Restore.ipsw

3.1.0 : iPhone1,1_3.1_7C144_Restore.ipsw

3.0.1 : iPhone1,1_3.0.1_7A400_Restore.ipsw

3.0.0 : iPhone1,1_3.0_7A341_Restore.ipsw

2.2.1 : iPhone1,1_2.2.1_5H1_Restore.ipsw

2.2.0 : iPhone1,1_2.2_5G77_Restore.ipsw

2.1.0 : iPhone1,1_2.1_5F136_Restore.ipsw

2.0.2 : iPhone1,1_2.0.2_5C1_Restore.ipsw

2.0.1 : iPhone1,1_2.0.1_5B108_Restore.ipsw

2.0.0 : iPhone1,1_2.0_5A347_Restore.ipsw

See also:

• Unlock iPhone 4 iOS 4.0.1 and iOS 4.0
• Jailbreak iPhone 4 iOS 4.0.1 and iOS 4.0
  
• iPhone tips and tricks