Downgrading from 10.4 to 10.3 on Mac Mini

Does anyone know how to identify which Mac Mini's are not downgradeable to 10.3? I know that if the Boot ROM is 4.8.9 (or below 4.9) it works fine, but is there any way to tell from the serial number or part number without having to open it up and start it? I need to aquire some of the older units, but if it's not opened, I don't know if there's any way to tell.

We are working with the 1.25Mhz versions. It is NOT true
that you can't install 10.3 if the system shipped with 10.4.
We have done this on many systems and it worked just fine.
Well in general you cannot downgrade to a lower version, specifically you may find an example or two. I don't think you are going get too much help in trynig to downgrade the machines that fail to do so. Apple does this so as not to have support calls.
The thing that changed is the Boot ROM when they changed
from >4.8.9 to 4.9.x and then 10.3 would no longer
install.
Basically that's what we've been saying regardless of the cause, you cannot downgrade - in general.
I believe the basic reason why downgrading fails is that as each new mac is release it may have some of its hardware changed/upgraded or added. Instead of trying to patch an older version of the OSX, Apple decided to make life easier. They just release an update OSX and not allow the user to downgrade because it may cause problems and/or increase support calls.
Mike

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