PwnageTool is a Mac-only utility. PwnageTool 2.2 will jailbreak your iPhone and iPhone 3G which allows you to install 'unofficial' softwares such as the iPhone unlock software called “yellowsn0w.” However, The new v.02.30.03 baseband firmware bundled with iPhone 2.2.1 OS is entirely incompatible with the “yellowsn0w” unlock utility that was recently released.
Yellowsn0w will NOT work with the baseband version (02.30.03) that is present in the recent 2.2.1 update. If you want to use Yellownsn0w you will need to create and restore using a custom .ipsw that will allow you to update safely to 2.2.1 without applying the 02.30.03 baseband update. You’ll then have a 3G iPhone running 2.2.1 with an older baseband version that is still vulnerable to yellowsn0w, so that yellowsn0w will still operate.
NOTE: If you have a 3G iPhone running 2.2 firmware and you want to keep your ability to use yellowns0w (or the option to use it in the future) do NOT use QuickPwn, and do not use the official ipsw or the iTunes update process without using PwnageTool.
Full details on all the steps you should do and where to download the iPhone 2.2.1 Jailbreak with Pwnage Tool 2.2.5 available from the official blog.
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