I'm not sure if there's all that many users with this problem, but after installing iTunes 8.2, I couldn't install my older firmware by pressing option+click-restore through iTunes. I wasn't given the option to browse for my firmware. I'm not sure why, but I found out that if you press option+alt while clicking restore, it allows you to do this. I'm not sure if this helps anyone, and would likely only be on a Mac. Just thought I'd share.