According to the Microsoft support website, the firmware update was originally made available on February 9, and it is meant for the locked version of the device available from AT&T.
Surface Duo firmware update
Here are the improvements available for Duo in February 2021:
Adds the ability to add a caller to conference calls in certain conditions. Improves audio quality when using speaker mode. Improves touch stability. Improves Surface Duo UI stability. Fixes scenarios outlined in the Android Security Bulletin – December 2020 and January 2021.
The update will download and install automatically, but you can get it manually from the Android update settings page if the device has not received it. The Microsoft Surface Duo is a dual-screen device connected using a 360-degree hinge design that creates an 8.1-inch canvas that runs on Android 10, and you can order it now from the Microsoft Store starting at $1000.
Surface Duo | See at Microsoft
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