MPH display not showing any speed

Joined
Feb 12, 2017
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My friend has a P4pro and the mph is not registering on display anymore, it just reads "0.0".
Not sure if it stopped after a resent firmware update or not but every other measurement is working fine.
He gets plenty of satellites locked on and all functions work fine.
Any suggestions on how to get the speed to work again?
 

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