Get rid of thing from database

I have a thing (fibaro universal sensor) which I did not get to run, I think its broken so I sent it back.
How do I get rid of that thing from openhab now. I tried to exclude it via HABmin: on the controller I click “exclude devices”, then I pressed the B-button 3 times, nothing happened.
I tried HABmin => “set device as Failed” => “remove from controller”. on the next network discovery it again apears as new thing.
I did delete it from can smarthome:things remove … but it again showed up as new device.
can someone tell me what to do to get rid of that thing… thanks!

Sometimes after exclusion you need to restart openHAB to get rid of those nodes.

did a reboot after each single step. somehow that device finally disappeared now, hopefully forever.

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