You would think if it runs OS3.9, it would run OS4.1.
No, one wouldn't think that, if they'd read any of the comments that came before this one or spent 30 seconds on google. 4.1 for Classics requires a PPC processor. There are no PPC processor boards available for CD32. Ergo, CD32 can't run 4.1.
http://blog.hyperion-entertainment.biz/?p=138