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Locked AT&T Surface Duos get new firmware update; Improves UI stability, audio quality and touch stability; Changelog

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Microsoft is rolling the February 2021 firmware update for the locked AT&T Surface Duos.


This update improves UI stability, audio quality and touch stability as well as introduces the ability to add a caller to conference calls in certain conditions.

Software versionUpdate info
2020.1211.86 (AT&T Locked Device)This update:

Addresses scenarios outlined in the Android Security Bulletin – December 2020 and January 2021.

Improves Surface Duo UI stability.

Adds the ability to add a caller to conference calls in certain conditions.

Improves audio quality when using speaker mode.

Improves touch stability.

How to get the update

Surface updates are released in stages – not every Surface will receive the update at the same time, but it’ll be delivered to all devices. If you haven’t received an update, see Update Surface Duo.

  • Software updates can’t be uninstalled or reverted to an earlier version.
  • When you install the latest update, you’ll also get all the previous updates if your Surface doesn’t have them already. Only updates that apply to Surface Duo will be downloaded and installed.
  • After the updates are installed, tap Restart now.

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