Important — Firmware Version Must Match

For replacement earbuds to synchronize correctly, both earbuds must be running the same firmware version.

All replacement earbuds sold by Earbud Express are updated to firmware version 5.22.1.

If your existing earbud is running an older firmware version, install the latest update using the Sennheiser Smart Control app before attempting to pair the earbuds.

Step 1 — Place both earbuds in the charging case

Whether you replaced an earbud or the charging case itself, make sure both earbuds and the case are together before starting the pairing process.

Step 2 — Remove MOMENTUM True Wireless 4 from Bluetooth

Open your device's Bluetooth Settings. Find your MOMENTUM True Wireless 4 and select Forget Device or Remove Device.

Step 3 — Charge if needed

If the earbuds or charging case have a low battery, place both earbuds in the charging case and charge for at least 30 minutes before continuing.

Step 4 — Factory Reset the earbuds

Place both earbuds in the charging case and leave the lid open.

Touch and hold the touch controls on both earbuds simultaneously for approximately 30 seconds until the LED indicators flash.

After the reset completes, leave both earbuds in the charging case for a few moments before continuing.

Step 5 — Connect your MOMENTUM True Wireless 4

Remove both earbuds from the charging case and place them in your ears.

Open your device's Bluetooth Settings and select MOMENTUM True Wireless 4 from the list of available devices.

You can also use the Sennheiser Smart Control app to complete setup and verify both earbuds are running firmware version 5.22.1.

Optional — Update Firmware

If synchronization fails, open the Sennheiser Smart Control app and check for firmware updates.

Both earbuds must be running the same firmware version to synchronize correctly. Earbud Express replacement earbuds are updated to version 5.22.1.