iH8sn0w the developer behind Sn0wbreeze jailbreak tool, like PwnageTool for Mac is working on next version, Sn0wbreeze 2.2  which will come with baseband preservation mode, it was first implemented in Tiny Umbrella for iOS 4.1, which allowed iPhone 4 users preserve baseband while updating to iOS 4.1. Unfortunately due some changes in iOS 4.2.1 the TinyUmbrella method to preserve baseband broke in 4.2.x.

But now that iH8sn0w is back with same feature in Sn0wbreeze 2.2, it would be easier for iPhone 4 users to update to new firmware without fearing of losing unlock.

Sn0wbreeze 2.2

As of now there is no ETA of Sn0wbreeze 2.2, but iH8sn0w plans to soon roll out Sn0wbreeze 2.2.

On side note, Redsn0w 0.9.7b2 for Mac has been released to do untethered jailbreak on iOS 4.2.1 on iPhone 4, iPod Touch 4G & ipad.

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