In the last post, we discused iPhone OS 3.1.3 Firmware and in that we told that we will share with you direct download link of iPhone OS 3.1.3 Firmware. As promised, here are the direct download links.

Download iPhone 2G 3.1.3 OS Firmware

Download iPhone 3G 3.1.3 OS Firmware

Download iPhone 3GS 3.1.3 IS Firmware

Warning : Please don’t upgrade to iPhone OS 3.1.3 Firmware if you are using jailbroken iPhone, because there is no tool available yet to jailbreak 3.1.3 firmware based iPhone.