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I'm reading this and wondering how this is a Mac OS X issue... this firmware jump happen in the move from Mac OS 8.6 to 9.x. And it was a one way move... once the firmware was upgraded you would no longer be able to run 8.6 again, the system's minimum OS becomes 9.x.
All this happened before Mac OS X was even released to the public.
As I recall, the B&W's fell into the same area where going back to 8.6 after the firmware update was no longer an option.
As for upgrading iMacs of that vintage, I've done tons of them without issue... but then again, it is what I do for a living. If you are trying to jump from 8.6 to 10.4 and have no experience beyond using 8.6 all these years, doing such a jump on your own would be (to say the least) naive.
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