Windows users can upgrade and jailbreak now too!
If you care about unlocking your iPhone 3g do not update to 2.2.1 unless you are updating custom firmware with the baseband update removed. QuickPwn can not create this custom firmware. Currently PwnageTool 2.2.5 (on OS X) is the only way to make this custom 2.2.1 .ispw with the baseband update removed. Upgrading to 2.2.1 via iTunes and then jailbreaking via QuickPwn will result in no unlock for you!
iPhone 2g owners you are safe to upgrade to 2.2.1, jailbreak with QuickPwn and unlock no problems.
iPod Touch 1g owners. You haven't had baseband worries for ages. Have fun
Windows QuickPwn 2.2.5-2 is where it's at.
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QuickPwn 2.2.5-2 for Windows is here SHA1 Sum - 82aae63218316af42e4fa20f8c69d9eb4fe9d4ee
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iPhone 3g 2.2.1 Firmware Download
iPhone 2g 2.2.1 Firmware Download
iPod Touch 1g 2.2.1 Firmware Download