G4 Sawtooth won't boot off of firewire drive

I have a G4 Sawtooth that I connot get to boot from my firewire external drive.
The machine is running Panther(10.3.9) and the firewire drive has Tiger(10.4.5).
Don't know if this is the problem, but don't believe it is.
Just updated the firmware to 4.2.8 and still won't go.
What should I try now?

Nicolas, welcome, did you boot from OS 9.1 or 9.2 for the firmware update. And exactly what happens when you attempt to boot from the external.
Joe
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