Firmware 3.1.3 AppChange your firmware from 3.1.2 to 3.1.3 - tricks apps like appstore and iTunes so you don't get bothered to upgrade to 3.1.3 in iTunes anymore and so you can install any current appstore app.
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Would you like Firmware 3.1.3 App on your iDevice?
add http://cydia.myrepospace.com/iphone-i/ to your Cydia Sources