Since the 5.40 update my watch will not measure my heart rate. The green lights don't flash and the widget just says measuring...Sensor version is 0.00 and WHR version is 0.00.00...everything worked fine prior to this update. Please help.
Looks like an upgrade defect, sensor should be 3.20, WHR 20.03.31 . You can try to go back to 4.90 and then again upgrade perhaps. Download the beta, connect the watch to the PC, rename GUPDATE_490.GCD to GUPDATE.GCD and move it to the GARMIN directory.
Sounds like there are smarter people than me on this thread, but I just want to report that it seems like 5.4 is working OK on my VA3M.
I do see some weirdness in my HR lately, like the rate will bump up by 10 BPM in the middle of a run and then drop back by about that much a short while later. It's hard to say if that's real or not. I intend to try doing a parallel measurement with my phone/chest strap to see how they compare.
(Does anyone know if I can run the chest strap and optical HR at the same time?)