Gadget News today about Apple today released the new iPhone 3.1.3 firmware for iPhone  or iPod touch. The new iPhone  SDK 3.1.3 with  Xcode. The new SDK 3.1.3 is available compatible with Leopard and Snow Leopard for iPhone and iPod Touch developers. If you want to update to iPhone OS 3.1.3 Firmware, all you will have to do is to connect your iPhone with your computer via usb and start iTunes. You should now see a message as shown below. Simply click on “Download and Install” button to get on to the new iPhone OS 3.1.3 firmware.iPhone OS 3.1.3.Currently Apple release update  iPhone SDK with new  version of the SDK to 3.1.3. Change log for iPhone 3.1.3 for improves accuracy of reported battery level,resolves issue where 3rd party apps would not launch in some instances and fixes bug that may cause an app to crash when using the Japanese Kana keyboard.There’s link for you download update new iPhone 3.1.3 firmware.