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Device Software Update: Microsoft Lumia 640
AT&T released a new Windows 10 update (MR1) on June 2, 2016, for the Microsoft Lumia 640 (SKUs 6764A, 6765A, 6766A). The Windows 10 update is only available over Wi-Fi via the Windows 10 Upgrade Advisor app, which you need to download from the Windows app store. A Wi-Fi connection is required.
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