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However, if you don't need to boot Mac OS 9 but only need to run the Classic environment, you can work around having to do a clean install via the following process:
If not, you may need to re-bless the Mac OS 9 System Folder per this Knowledge Base article.
Second, if you have a non-bootable Software Restore CD which includes Mac OS 9.2.2, you can simply insert the dic, open Software Restore, and select to restore only Mac OS 9.
If you have a standalone Mac OS 9 retail CD, you can try the same steps listed for the restoration disc, though you may run into issues depending on how new your Mac model is.