I am currently running 3.0 on my 3GS and I am trying to restore the firmware. I shift+click the restore button and select the firmware from my harddrive, but as it begins the process it tells me that "this device is not eligible for the requested build". I thought it wouldn't let you restore to 3.0 only if you were running 3.1, but I have never upgraded this phone to 3.1. I am running iTunes 9. What's going on?