Delete Device from client list..

So i have this problem again, How do i delete device from the client list, AKA the devices shown in QOS (Advanced_QOSUserRules_Content.asp) Source IP or Mac, from the router?

The device is gone and broke there for i cant access to see it the client list page to delete it. And I really dont want to factory reset the router to just remove that device from the list.

I have already removed it from the mac address list but it remains in QOS list of devices. and which is the Client list and the...

Delete Device from client list..