Hi, i bought a kit with two SMH5-FM (Open Helmet). One of them works just fine. I can listen to all available FM stations, almost everywhere. The other one just tune one single station, when it works. I even tried presetting them using Sena Bluetooth Device Manager, them selecting the presets, but all i can hear is noise. I tried swapping the mic/phones, but it seems a hardware issue, because it's always the same unit that can't tune the stations. Is there anything i can do? I already upgraded both firmwares to 2.0, tried reseting the unit, but nothing seems to work. All other features are just fine. 

Thanks,