Today, we’re pleased to begin the roll-out of Windows 10 Mobile to select Windows Phone 8.1 devices. There are a lot of great new features in Windows 10 Mobile, like Continuum, Windows Hello and Cortana.
The current list is restricted to a subset of Lumia devices, and it seems like the first generation of Windows Phone 8.x devices – such as my HTX 8X – won’t be getting the Windows 10 update. Microsoft will also disable insider builds for these first generation devices.
Each and every build asked for feedback on a number of things including responsiveness of the device. I guess the HTC 8x and other gen1 got a score below their threshold