https://www.windowscentral.com/lumi...etting-windows-10-mobile-fall-creators-update
Microsoft has today published a list of supported devices for the upcoming Windows 10 Mobile Fall Creators Update, and it appears the company is omitting yet more Windows phones from its list of supported handsets. This time, the Lumia 640 and Lumia 640 XL series are being abandoned on the Creators Update, with no official upgrade path to the Fall Creators Update.