If there are some errors while upgrading, go to WDRT and see if there is any update in the phone and when it gets updated then go to the OTC updater and it will work.
Remove the device after an update has started. The tool automatically checks and downloads the available update. It is recommended to back-up contacts, photos, files etc. The device has enough free storage space to upgrade and the battery has over 40%. Internet connectivity over Wi-Fi is needed when upgrade. Sadly, Microsoft is giving Windows 10 OTA only for these following Lumia smartphones running Windows Phone 8.1 Denim:- Lumia 1520, Lumia 930, Lumia 830, Lumia 735, Lumia 730, Lumia 640 XL, Lumia 640, Lumia 635 (1 GB RAM), Lumia 540, Lumia 535, Lumia 532, Lumia 435, and Lumia 430. Here is the upgrade process of windows 8.1 to 10 mobile in 2020.Īlmost all devices can be upgraded which have a minimum of 1 GB RAM. 
Therefore, in windows 8.1 mobile, we cannot connect to Microsoft account nor download apps. Microsoft official shut down windows mobile.
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