iPhone developer ih8sn0w has released Sn0wbreeze 2.2. Sn0wbreeze is a Pwnage Tool for windows. It is used to create custom firmware files on Windows. Sn0wbreeze 2.2 incorporates the kernel based GreenPois0n exploit for untethered 4.2.1 jailbreak.
‘Baseband Preservation Mode‘ is the most highlighted feature of Sn0wbreeze 2.2 .This new mode enables iPhone 3G/3GS/4G users to preserve their baseband while upgrading to iOS 4.2.1. In this way, they can unlock using existing version of Ultrasn0w.
Sn0wbreeze 2.2 can play Pac-Man game while custom IPSW is being built for your iPhone, iPad or iPod touch.
• iPhone 4, 3GS, 3G
• iPod touch 4G, 3G, 2G