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Software Update showed me the iMac EFI Firmware Update version 1.3 ready to install, so I would check it and download and install the update. The instructions said that System Profiler would say I had a Boot ROM Version of IM71.007A.B03, but it kept saying I still had IM71.007A.B00. I tried rebooting, running software update again, installing again, rebooting, but nothing changed.

Well, it turns out for some reason this installer just puts ‘iMac EFI Firmware Update.app’ in your Utilities folder and you have to manually run it yourself. This is different than every other update I’ve run from apple and there was no indication that this was a manual firmware update. Thanks to khorton and mirgilwin1 on version tracker for the heads up.

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