Download Apple iPhone Firmware Files (Stock Factory Firmware):

iPhone Wiki has a nice little grid with links to download the firmware (for all iPhones, iPad, iPod Touch) as well as jailbreak/unlock status. Check it out!

Firmware files for iPhone 4

iOS 4.1

iOS 4.0.2

iOS 4.0 for iPhone 4

Firmware files for iPhone 3GS

iOS 4.1

iOS 4.0.2

iOS 4.0 3GS

iPhone 3GS Firmware v 3.1.3

iPhone 3GS Firmware v 3.1.2

iPhone 3GS Firmware v 3.1

iPhone 3GS Firmware v 3.0.1

iPhone 3GS Firmware v 3.0

Firmware files for iPhone 3G

iOS 4.1

iOS 4.0.2

iOS 4.0 3G

iPhone 3G Firmware v 3.1.3

iPhone 3G Firmware v 3.1.2

iPhone 3G Firmware v 3.1

iPhone 3G Firmware v 3.0.1

iPhone 3G Firmware v 3.0

iPhone 3G Firmware v 2.2.1

iPhone 3G Firmware v 2.2

iPhone 3G Firmware v 2.1

iPhone 3G Firmware v 2.0.2

iPhone 3G Firmware v 2.0.1

iPhone 3G Firmware v 2.0

Firmware files for iPhone 2G (original)

iPhone Firmware v 3.1.3

iPhone Firmware v 3.1.2

iPhone Firmware v 3.1

iPhone Firmware v 3.0.1

iPhone Firmware v 3.0

iPhone Firmware v 2.2.1

iPhone Firmware v 2.2

iPhone Firmware v 2.1

iPhone Firmware v 2.0.2

iPhone Firmware v 2.0.1

iPhone Firmware v 2.0

iPhone Firmware v 1.1.4

iPhone Firmware v 1.1.3

iPhone Firmware v 1.1.2

iPhone Firmware v 1.1.1

iPhone Firmware v 1.0.2