Easiest way to reset bluetooth headphones?

and after the reset, delete them from your phone's bluetooth list as well before pairing again. the phone holds on to the old pairing keys, tries those, fails, and it looks like the reset didn't work.

which brand are they? the combo differs on nearly every model. before you reset anything though, forget them on every device they've ever paired with - usually they're just quietly reconnecting to a phone in the next room.