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@Gordon
Ok, great! I think you should still be able to create useful data even with a 'normal' build using the binary blob. While the recorded HRM will be from the binary blob, the raw sensor data will be off the sensor, so when the test harness runs it'll still be able to return data from the open source algorithm.
Well, now you have the chest strap if you've got time I'd be interested to see if you find that the data from the binary blob is off by 10% as well - I'm not sure if it's something to do with the older VC31 sensor in the original Bangles, or if it applies to the VC31B as well