After Apple has launched the iPad tablet computer which runs on iPhone OS 3.2 it has released a new update for the iPhone and iPod touch operating system. The latest versions 3.1.3 of the iPhone operating system (OS) include security patches, bug fix, with several iPhone feature improvement. The security patch would for example protect your iPhone against maliciously crafted MP4 file. Thus, the version 3.1.3 operating system update is very essential for iPhone.

It’s highly recommended to update to the latest operating system version of iPhone. But for the jailbreaking community the iPhone OS 3.1.3 update poses a challenge. Popular jailbreak software tool like PwnageTool, Blackra1n, or RedSn0w are currently not compatible with version 3.1.3. Thus, it’s not recommended for those jailbroken iPhone or iPod touch to upgrade to the latest iPhone OS 3.1.3 update.

There are experiments with RedSnow 0.9.2 software that successfully done iPhone OS 3.1.3 update.

Read more about the detail from iphonehacks.com:
http://www.iphonehacks.com/2010/02/redsn0w-jailbreak-iphone-os-313.html

Consult first the jailbreaking experts as a precaution. Finally, do the jailbreak method iPhone OS update at your own risk.