Help needed to delete Super Administrator
 

I'm trying to delete the details of a developer who helped me to install the forum - I recently noticed he had logged in and I don't want him to have access to the Admin CP.

I've edited the Config file and deleted his id number from all of the various fields. However, when I try to change his User Group from Super Admin to anything else I am still getting the following message:
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Sorry, this user is protected from being altered in the config.php file by the $config['SpecialUsers']['undeletableusers'] variable.
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I have checked the config file and his id is nowhere to be seen - how can I delete this Super Admin?

Any help would be appreciated.

D