Often the nRF52 micros get stuck or misbehave and reach a weird state with the pairings. Often the solution is just to clear them so here’s adafruit’s code to do that and a platform.io ini to make it easy. platformio.ini [env:clearbonds]platform = nordicnrf52 board = particle_xenon framework = arduino The board can be any nrf52 board, it can be any generic board that uses the same chip that you actually have. For example particle_xenon uses nRF52840, so it can be used for any 52840 board....