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How to disconnect my Dr btn200 headphones. ?

I want to connect the headphones to my device, and they've been connected before, but I made my device forget them. Now they indicate that they've connected to something and don't show up on my Bluetooth, the also don't connect via NFC. I've tried resetting them via the little button next to the charger port but that doesn't work either. This happened before but I had to leave them for a few months. 

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