Is there any shortcut to get my L640XL from WP8.1 to Latest Update of W10M?

[Muhammad Nura]

I downgraded my phone to WP8.1 using Windows Device Tecovery Tool because of the issues I had. Now I want to get back to W10M, I don't know if there is a way I can get my phone to the latest production ring.

 

[TechFreak1]

You will need to install the upgrade advisor app from the store.

Link below:

W10M Upgrade Advisor

Official list of phones upgradeable:

Lumia Icon, 1520, 930, 640, 640XL, 730, 735, 830, 532, 535, 540, 635 1GB, 636 1GB, 638 1GB, 430, 435, BLU Win HD w510u, BLU Win HD LTE x150q, MCJ Madosma Q501

Additional information:

blogs.windows.com/windowsexperience/2016/03/17/upgrading-existing-windows-phone-8-1-devices-to-windows-10-mobile/#W0U2IOLI1ZACZcQJ.97

 

[Ryujingt3]

The above should work just fine for you.