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HRM-Run heartrate dropouts

I am using Garmin FR245 and Garmin HRM-Run(red) heart rate strap

It started on 23 March

HR mesurement has a lot of dropouts (150-70-152-92-149-73-150....), as a result average HR is very low

9.56 beta software did't help

New HRM-Run strap didn't help

Resetting watch didn't work

Where can I find older watch firmware versions, especially sensor hub version can be problemmatic.

sw 9.56 beta
gps 5.30
ciq 3.3.1
bmx 5.0.5
whr 5.00.05
ant/ble/bt 6.15
sensor hub 18.00