How to Fix Bose QuietComfort Earbuds II One Earbud Fails to Pair

Quick Diagnosis

A pairing mismatch occurs when one earbud fails to sync with the case's controller board, preventing the dual-channel Bluetooth handshake. Performing a physical charging case reset aligns the firmware states of both earbuds and clears the paired device list.

Technical diagnostic blueprint diagram for the Bose QuietComfort Earbuds II showing symptoms of One Earbud Fails to Pair.

Step-by-Step Resolution

  1. 1

    Connect the charging case to a USB wall charger using a verified power supply and cable.

  2. 2

    Place both earbuds into the charging case, ensuring they snap magnetically onto the charging pins.

  3. 3

    Open the charging case lid and keep it fully open during the entire reset process.

  4. 4

    Press and hold the physical Bluetooth button on the back of the case for 30 seconds.

  5. 5

    Release the button after the status light blinks white twice, blinks blue, and then turns off.

  6. 6

    Wait for the status light to blink white 5 times and then slowly blink blue to indicate that the pairing memory has been cleared.

Alternative Causes & Edge Cases

  • Applies to Bose QuietComfort Earbuds Ultra and Bose Sport Earbuds models.
  • Pocket lint or oxidation on the metal contact points in the case can prevent one earbud from receiving the reset signal.