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forerunner 255s suddenly missing HR sensor, the green light is not showing,

9568140 over 1 year ago

tried factory reset, data reset, not working

tried holding start and back button and tone is there, but still not working

firmware 19.18 WHR 16.01.02

yesterday it worked, now suddenly it doesnt

0 5148720 over 1 year ago

Many posts on that already. 19.18 is a crap, and no way to revert it.

0 9568140 over 1 year ago

it literally made my forerunner useless, and garmin support asked 118 euro for repairing it :((