Sennheiser M3AEBTXL Instruction Manual page 32

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Resetting the headphones to the factory default settings/Reset
The Smart Control app allows you to reset the headphones to the factory default settings
(e.g. EQ settings, ANC mode).
If the TILE function is activated (> Using TILE to locate the headphones), the TILE settings
are not reset. To reset the TILE settings, deactivated the headphones in the TILE app.