Sony MDR-MV1 Open-Back Reference Monitor Headphones - Manual (Page 121)

This operation resets volume settings, etc. to the factory settings, and deletes all pairing information. In this case, delete
the pairing information for the headset from the connected device and then pair them again.
If the headset does not operate correctly even after initializing, consult your nearest Sony dealer.
Related Topic
Resetting the headset
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When initializing is complete, the (power) indicator (white) flashes 4 times.
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