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I cannot recall where stuff lives in Pro Tools 9. But on Ventura, with 2022.10 this is what I see for C24 related files.
/Users/user/Documents/Pro Tools/IO Settings/C24 LE Stereo.pio
/Users/user/Documents/Pro Tools/IO Settings/C24 Mix.pio
/Applications/Pro Tools/Contents/SharedSupport/Factory Content/IO Settings/C24 LE Stereo.pio
/Applications/Pro Tools/Contents/SharedSupport/Factory Content/IO Settings/C24 Mix.pio
/Applications/Pro Tools/Contents/Frameworks/Controllers/C24.bundle
The C24.bundle is the "personality file". I can't recall if it ever gets copied some place else if a C24 is actually connected.
After trashing prefs and testing from a new admin account, if stuff still does not work you maybe can try searching for similar files. In Terminal.app type:
Code:
$ sudo find / -name C24\* -print
(and enter your password)
($ is the command prompt, that may be different for you, don't enter that)
To find all files starting with C24 anywhere on your computer (may take a while to finish).