A firmware update for the Sony SRS-XB21 Bluetooth speaker is a software update that improves the speaker’s performance and adds new features. Firmware updates can be downloaded and installed via the Sony Music Center app.
Firmware updates for the SRS-XB21 have included improvements to the speaker’s sound quality, battery life, and Bluetooth connectivity. Some updates have also added new features, such as the ability to connect the speaker to multiple Bluetooth devices simultaneously.
