Apple has just released Firmware 3.1.3 (7E18) which mainly aims to correct bugs and improve the following points:
A more accurate display of the battery charge level on iPhone 3GS The resolution of a problem sometimes preventing the opening of certain third-party applications The correction of a bug occasionally causing an application to crash when using the Japanese keyboard in kana characters
For more information, you can consult Apple's official page.
For his part, the Dev Team is formal and recommended not to make this update until further notice!
We discuss it on the forum
Thank you Luc, Bernd and Xavier
The baseband (the modem software which manages the telephone part) was modified on 05.12.01, if you have a desimlock telephone in order to use another network partner, it is essential to don't do this update.
Tools such as Cleaning, Blackrain and Redsnow are incompatible with this new firmware.