According to the Microsoft support website, the firmware update was originally made available on January 27, and it is meant only for unlocked devices.
Surface Duo firmware update
Here are the improvements available for Duo in January 2021:
Fixes scenarios outlined in the Android Security Bulletin (December 2020 and January 2021). Adds the ability to add a caller to conference calls in certain conditions. Improves UI stability. Improves audio quality when using speaker mode. Improves touch stability.
The update will download and install automatically on your device, but you can get it from the Android update settings page if you have 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 for $1400.
Surface Duo | See at Microsoft
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