1.0.2 user would like to upgrade to newest firmware using windows

[canikickit]

I have a jailbroken phone with version 1.0.2 firmware and still running on att. I would like to update to the newest version of firmware. Can I just factory restore straight to the newest version? or do I need to upgrade to 1.1.1 first? If this has already been asked and answered, please point me in the direction of the answer. Any help would be great. Thanks.

I had already posted this before, but the response I got was for modding in OSX. I am a windows user.

[freshfitz]

If you did NOT run unlock software against the phone you can do the upgrade if the phone is activated by att it will work fine you will have to re-jailbreak it once on 1.1.1

If you ran unlock software against the baseband you will have to re-viriginze then upgrade