Sony SRS-X99 Help Manual page 306

UPDATE button (This does not necessarily apply to all cases.).
Software update may fail during the procedure if the network environment is not adequate. In this case, update the
software by using a USB flash drive. For details on the update procedure using a USB flash drive, see the Customer
support websites.
The pre-installed software can be updated automatically when the speaker is connected to the internet; whether via a
wired or Wi-Fi network as the default setting. If you want to deactivate this automatic update function, change the
setting of [Auto Update] by using your smartphone/iPhone with SongPal installed. When the speaker detects the
availability of a software update, the update will start during the night when the speaker is unlikely to be in frequent
use. The UPDATE button works as described in this Help Guide.
Note
Updating normally takes 3 to 10 minutes. It may take longer depending on your network environment.
Keep the speaker connected to the power supply and network while updating.
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