Sennheiser SPORT True Wireless Instruction Manual page 36

FAQ/If a problem occurs ...
36 | SPORT True Wireless
Resetting the earbuds to the factory default settings
If the function of the earbuds is disturbed and a reset (> 35) does not
improve, reset the earbuds to the factory default settings. This
deletes, among other things, all pairing settings.
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You can reset the earbuds to the factory default settings using the
Smart Control app.
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If the Smart Control app is not available, pair the earbuds with
each other (> 18).