Dear Martin,
I checked at the Everymac site, and it says that all G3 ibooks can run a version of OS 9, with the newest being 9.2.2; all the G4 ibooks run only OS X versions. Here's the list page (sorted by processor speed):
http://www.everymac.com/systems/apple/ibook/
You click on the model you have, then look in the table for 'supported Mac OS'
About updating, or actually 'downdating' firmware I don't know. If you post your exact model, I'm sure other members can advise you whether you need OS 9, or if OS X will run fast enough.
Greetings,
Ge'
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