The external keyboard configuration from Preferences|Keyboard|Modifier Keys is not working properly on my Sierra mac. It works fine for the same and other external/USB keyboards on my two El Capitan machines.

The following http://rainer.4950.net/2009/09/30/resetting-the-usb-keyboard-type-on-mac-osx/ recommends to disconnect the external keyboard and then delete /Library/Preferences/com.apple.keyboardtype.plist.

However after having done so - and verified the file no longer exists:

$ls -l /Library/Preferences/com.apple.keyboardtype.plist
ls: /Library/Preferences/com.apple.keyboardtype.plist: No such file or directory

But the external keyboard still shows up:

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I am trying to get back to the "Unrecognized keyboard" dialog - in the hopes of fixing key mapping problems only on this Sierra machine: specifically

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The end goal is for the following to actually work properly: i.e. disabling caps-lock and swapping option and command.

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Instead those customized settings are presently ignored and only the default mappings are actually enabled.

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