The Garmin HRM Dual is stuck at 0 BPM using both the Strava and Polar Beat apps. Both apps succesfully connect to the HRM Dual via bluetooth. The problem initially arose as the monitor got 'stuck' for a few minutes at a given BPM (i.e. The Strava App would display exactly 152 BPM for over a minute). To address this, I changed the batttery. After changing the battery, the BPM displayed is always 0.
So far I have tried using a different app, performing a reverse polarity reset, letting the HRM sit without a battery installed for 15 minutes, and disconnecting and reconnecting the device to my phone via bluetooth. Absolutely nothing has worked.