Firmware update steps:

Step 1: Go to the main page of sound+ and select "Headphones" and "Settings" in the upper right corner.

Step 2: Select "Headphone Firmware" and update according to the operation.

Step 3: Put the earphone into the earphone box to ensure that the earphone box has enough power. It will take about 15min to upgrade.

Step 4: The upgrade is completed.

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