Surface Duo September 2021 update rolling out now

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Surface Duo 2020 Battery StatusSource: Daniel Rubino / Windows Central

Microsoft’s Surface Duo recently received another monthly update. Following the update, unlocked Surface Duo’s in North America will bump to software versions 2021.817.35 and 2021.817.37, respectively. The update includes security fixes but does not bring any new features. Microsoft started shipping the update on September 16, 2021.

“Addresses scenarios outlined in the Android Security Bulletin – September 2021,” reads the changelog for the update. You can read the complete Android Security Bulletin from this month at

Those waiting for Android 11 to ship to the Surface Duo will have to continue to be patient. Microsoft still hasn’t confirmed a release date for Android 11 on the Surface Duo. Our senior editor Zac Bowden touches on this in his piece covering one year with the Surface Duo.

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The Surface Duo 2 will reportedly ship with Android 11 out of the box. Microsoft will likely announce the Surface Duo 2 on September 22, 2021 at its Surface hardware event. The foldable device will likely be unveiled alongside the Surface Pro 8, Surface Book 4 (which may go by another name), and other new Surface hardware.

To grab the update yourself, use these steps:

  1. Connect to a Wi-Fi network.
  2. Select Settings on your Surface Duo’s home screen.
  3. Select System.
  4. Select System Update.
  5. Select Check for update.
  6. Select Restart now.

Once we receive the update on our hardware, we’ll add the size of the update to this piece. A similar update from July 2021 was 20 MB, so it’s reasonable to expect this new update to be small as well.

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