Sonos product shows continuous flashing white light after updating to 15.6

As of Sonos software version 15.6, we’ve adjusted how some of our older Sonos products are using their internal memory. If something goes wrong during the update, such as a loss of power, the Sonos product may fail to start up afterwards. This is indicated by a continuously-flashing white status light.

This article covers how to fix an affected Sonos product in this condition.

Affected products

This article applies to the following Sonos products running software version 15.6 or later:

  • Boost
  • Connect
  • Connect:Amp
  • Play:1
  • Play:3
  • Sub (Gen 1)
  • Sub (Gen 2)

If you’re having a similar issue with a Sonos product that is not listed here, please contact Sonos Support for further assistance.


This solution applies if your affected Sonos product shows a continuously flashing white light and does not switch to a solid white light after updating to software version 15.6 or later. In the Sonos app, the Sonos product is shown as “Not connected” or “Updating.”


Your Sonos product needs to temporarily connect to the Internet through a wired Ethernet connection in order to resolve this issue. You may need to unplug your Sonos product from power and plug it in closer to your router to complete these steps.

  1. Connect the affected Sonos product to your network using an Ethernet cable.
  2. Wait about five minutes for your Sonos product to fix the issue. Your Sonos product will show a flashing white light during this process.
  3. Once complete, your Sonos product will show a solid white light and will reappear in your Sonos app.

You may need to retry the update using the Sonos app in order to complete the update process. After your Sonos product is able to start up, you can disconnect the Ethernet cable.

If this issue persists after following the steps above, please contact Sonos Support for further assistance.

Still need help?

Our technicians can help over the phone or with a live chat. You can also ask questions and find answers with other Sonos owners in our Sonos Community.