Sony SRS-X99 Help Manual page 294

UPDATE button
Lights up (orange)
The speaker detects the availability of a software update while connected to the internet. When you tap and hold the lit
button, the update of the speaker's software is started.
Flashes (orange)
The speaker is updating the software. During the update, you cannot operate the speaker.
When the speaker turns on for the first time after the software update, the UPDATE button flashes three times to
inform you that the update is completed.
*1
If software update fails, the indicator also lights up.
*2
When checking Wi-Fi signal strength, the indicator also flashes.
*3
When switching the wireless function to on or off, the indicator also flashes.
*4
When switching the BLUETOOTH audio streaming, the indicator also flashes.
Related Topic
Parts and controls (Main unit)
Updating the pre-installed software
Checking the Wi-Fi signal strength (reception sensitivity)
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