Sony LinkBuds S YY2950 Reference Manual page 156

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.
About the instruction manual video
Watch the video to find out how to initialize.
https://rd1.sony.net/help/mdr/mov0049/h_zz/
Hint
You can also initialize the headset with the "Sony | Headphones Connect" app.
Note
When the remaining battery charge of the charging case is not sufficient, the headset will not start initializing. Charge the
charging case.
If the indicator (green) on the charging case does not flash 4 times after performing step
initialized. Try again from step
If you have updated the software after purchasing the headset, the software is retained updated even if you initialize the headset.
When you initialize the headset to restore to the factory settings after you change the language of the voice guidance, the
language will also return to the factory settings.
.
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, the headset has not been