IPSW

Sn0wBreeze 3.1.3 update is now available for download allowing users to create custom 3.1.3 IPSW restore files while retaining the older baseband so they can still enjoy existing blacksn0w or ultrasn0w iPhone unlocks.

To get iPhone OS 3.1.3 with jailbreak and carrier-unlock all you need to do it to create a custom IPSW file using Sn0wBreeze 3.1.3 (download link after the jump) and restore you iPhone with this newly created IPSW file having older baseband.

Much needed utility for creating custom IPSW files on Windows Sn0wbreeze 3.1.2 Final is now available for download, Sn0wbreeze 3.1.2 Public Beta download shared earlier had Expert Mode disabled but the final version has it enabled which lets users create custom IPSW files with options including changing of boot and recovery logos, enabling verbose boot mode, download and add applications packages, include blacksn0w or Bootneuter unlock, add Cydia and Rock installers, pre-hactivate the phone, make IPSW NOR only and change root partition size.

Sn0wbreeze lets Windows users create customized iPhone/iPod IPSW restore files having their personal selection of applications and customizations to be pre-compiled into the restore file so they can restore as many devices as they like to a fixed configuration without working individually on every device.

Apple seems to have equipped iTunes 8 to detect and prevent the Pwnage exploit, iTunes 8 will now flash the error below if you try to load an Pwned IPSW file with an unPwned device preventing the exploit to suceed.

But, the iPhone Dev Team seems to have already figured the way out by patching the iTunes 8 itself,
In an blog post iPhone Dev Team said:

The nice thing about iTunes decisions is that we can provide you with patches to counter them. We have one such patch already for Mac iTunes 8 for iPod touch. We’ll be working out the full suite of patches for all the combinations over the next week.