I had this issue a while ago on my Fenix 6x
See the last post in this thread:
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Brilliant, thanks Doug. The last poster on that thread was a top bloke 
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Did a bike session with the tri club today and my HR readings seem way too low. This was recorded via external HR. Is there any way to revert to the wrist HR?
I’m assuming not, but thought I’d ask…
If it’s already saved I’m pretty sure not, I haven’t seen anything I’m afraid.
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