The firmware of the iPhone is essentially the OS. To find out which version you currently have, on your iPhone go to Settings>General>About>Version. There you will see your firmware version.
Apple has the firmware versions available for download. Here are the links:
iPhone firmware version 1.0
iPhone firmware version 1.0.1
iPhone firmware version 1.0.2
iPhone firmware version 1.1.1
iPhone firmware version 1.1.2
iPhone firmware version 1.1.3
iPhone firmware version 1.1.4
iPhone 2G firmware version 2.0
iPhone 3G firmware version 2.0
iPhone 2G firmware version 2.0.1
iPhone 3G firmware version 2.0.1
iPhone 2G firmware version 2.0.2
iPhone 3G firmware version 2.0.2
iPhone 2G firmware version 2.1
iPhone 3G firmware version 2.1
Iphone Firmware Download
iPhone 5 (GSM iPhone5,1): 6.1.2, 6.1, 6.0.2, 6.0.1, 6.0
iPhone 5 (Global iPhone5,2): 6.1.2, 6.1, 6.0.2, 6.0.1, 6.0
iPhone 4S: 6.1.2, 6.1.1, 6.1, 6.0.1, 6.0
iPhone 4 (GSM iPhone3,1): 6.1.2, 6.1, 6.0.1, 6.0
iPhone 4 (GSM iPhone3,2): 6.1.2, 6.1, 6.0.1, 6.0
iPhone 4 (CDMA iPhone3,3): 6.1.2, 6.1, 6.0.1, 6.0
iPhone 3GS: 6.1.2, 6.1, 6.0.1, 6.0Firmware is the name given to the set of programs that are an integral part of the operation of a computer’s hardware.…
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