A new version of popular iPhone jailbreaking utility for Windows Sn0wbreeze is now available for download, the update brings better reliability, faster speed, smaller package size and fix for 64-bit machine support. Latest version of Sn0wbreeze can be downloaded from the link provided at the end of this post.

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.