Change certificate of a managed AP?

Tzunami

Is it possible to add a new certificate to a AP (WAX650S) managed by a USGFlex200?

When I'm connecting direct to the AP, I will get a “not secure” message of the browser. I have added the cert and give the rights, but the browser says:

This server could not prove that it is 192.168.xxx.xxx. Its security certificate is from wax650s_xxxxxxxxxxx. Possible reasons include a misconfiguration or an attacker intercepting your connection.