I just got the Zephyr HxM and when I put it on and went to pair it my ATT Tilt (WM 6.1) saw it and connected but then instantly disconnected. When I try and force connect it states "The connection failed or the passcode is incorrect".
Zephyr did a lousy job on instructions by not even stating the passcode is 1234 (as I found through this site). They give no instructions or troubleshooting.