Just a quick Question though.
Is it possible to do an offline update of any lumia phone like we install custom roms in Android mobiles? I've a Microsoft Lumia 640 XL Dual sim with Windows Phone 8.1 Update 2, and wanted to update it to Windows 10 without using Wifi or Data Connection in phone (assume that I might have limits for using both).
Can we download an ISO or such file(s) from Microsoft (either official update or preview builds), copy it to phone's SD/Internal Memory (if no SD support) and then update from there?
I googled and i couldn't find a proper answer anywhere.