Where can I download 3.x firmware files for the original iPhone (2G)?

Apple's original iPhone (2G) shipped with the iPhone 1.0.0 operating system and runs firmware version 3.x with some limitations. On your computer, right-click the link below to download the official firmware restore file.

iPhone (2G) firmware version 3.0.0 can be found here: iPhone1,1_3.0_7A341_Restore.ipsw
iPhone (2G) 3.0.1: iPhone1,1_3.0.1_7A400_Restore.ipsw
iPhone (2G) 3.1.0: iPhone1,1_3.1_7C144_Restore.ipsw
iPhone (2G) 3.1.2: iPhone1,1_3.1.2_7D11_Restore.ipsw
iPhone (2G) 3.1.3: iPhone1,1_3.1.3_7E18_Restore.ipsw

There will be no further updates from Apple to original iPhone (2G) firmware after version 3.1.3.