Apple released iPhone OS 3.1.3 just a few hours ago and it it is now available for download directly from iTunes or from our iPhone downloads page.
This is a very minor update, and to be honest, it’s almost deceiving. If I had to give my opinion on this, I’d say that Apple released firmware 3.1.3 just to piss off the Dev Team, who released RedSn0w 3.1.2 jailbreak just days ago.
The “fixes and improvements” for iPhone OS 3.1.3 are as follow:
improves accuracy of reported battery level on iPhone 3GS
resolves issue where 3rd party apps would not launch in some instances
fixes bug that may cause an app to crash when using the Japanese Kana keyboard
Additionally, Apple has updated the baseband from version 5.11.07 to 5.12.01 on the iPhone.
As usual when a new firmware update is released, it is recommended for jailbreakers and unlockers alike not to update their device. If you update to 3.1.3, you will lose your jailbreak and/or unlock.
More info will follow as it comes. For up-to-date news about jailbreaking, make sure to read our iPhone jailbreak section.