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This seems to be based on an upgrade to the EFI firmware, in addition to the 10.8.2 update. While I've got verified backups for the OS, I'm not in the habit of regularly backing up the EFI firmware, nor do I know how I would restore it on my MBP.

Anyone got advice for backing up firmware on laptops to allow for roll-backs on breaking changes?

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I'm not sure there is a way for an end-user to revert to a previous version once a firmware update has been successfully applied.

If it wasn't successful, you could use the firmware restore CD that came with the box, or create the CD to do that, but again, that only works for failed upgrade attempts.

I've had to do this once in the past, and the easiest way I could find was to just take it to the local Apple Support shop and get them to do it. They did it for me while I waited, and it didn't cost me anything but time. YMMV.

But good point... I'm not in the habit of backing up firmware.

Just to confirm, this is only caused by 10.8.2, not the EFI firmware update. So you can rollback to a 10.8.1 backup and everything works fine.

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