If you use Pwnagetool to create a customize file (on MacOS), then use Quickpwn on Windows to flash my iPhone. Will the baseband be updated then?
My problem is I have no access to a MacOS, I wonder if Pwnagetool will work on VMWare or Sun VirtualBox? Or does someone have a FW2.2.1 customized firmware available?
I currently have a iPhone 3G with baseband 2.28
Why on earth do you want to upgrade to 2.21?
If you can find an ispw created with a MAC preserving the BB then you bcan use it to upgrade using quickpwn on windows but really, why?
There are some games that I cannot install on FW2.2, but works fine on FW2.2.1 (e.g. 1vs.100)
Which is why I use FWChanger - it's far easier and safer than upgrading your FW!