No Mac OS 9.0.4 possible!!!
http://docs.info.apple.com/article.html?artnum=75103--------------------------------------------------------
Some Performa or Power Macintosh 5200 series, 5300 series, 6200 series,
and 6300 series models cannot use Mac OS 9.0.4 or 9.1 until a hardware problem is fixed.
The repairs are covered under the Apple repair extension program.
To see if your computer has this hardware problem, use the 5xxx/6xxx Tester utility
in the Utilities folder on the CD before installation.
--> The Tester utility says an upgrade is not possible until this hardware problem is fixed
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best regards
Watz