I paired my new FR 235 with my old Garmin HRM chest strap, all good, then they failed to connect (HRM also failed to connect to my Edge 800), so I replaced the HRM battery (it was down to 1V). Now the HRM won't pair with either the FR 235 or the Edge 800. Rescanning on the FR doesn't see it. Rescanning on the Edge seems to do nothing. Updating the Edge firmware (and the FR's) hasn't helped. Turned everything on/off several times. There's a voltage across the HRM terminals.