![]() Once updated, the firmware cannot be reverted to an earlier version.Disconnect all other Bluetooth devices, such as wearable devices or smart watches, from your Android or iOS device before starting the update.Make sure both devices (Android or iOS device and the headphones) are fully charged.Do not perform the update in a location where the Wi-Fi signal is inconsistent, such as on a train, in a place where Wi-Fi signals become congested, or near a microwave, cordless phone, or any other devices that use the 2.4 GHz band frequency radio waves. ![]() Do not tap the power button in the Sony | Headphones Connect app.Do not charge the battery or turn off the headphones while downloading, transferring data, or updating, otherwise the headphones may become unusable.This item is shown only when the device is connected. Select the Version of your device shown in the Menu.Note:The device displayed on the screen depends on the device connected. Tap the three dots (menu button) in the upper right corner.Connect your headphones to the Sony | Headphones Connect application.Launch the Sony | Headphones Connect application. ![]() If you're not sure, it's easy to check which version of firmware you have: If the firmware is version "2.0.2" or above, you Do not need to perform the update.
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