HTC Windows Phones 8X, 8S, and 8XT will now be able to get the Windows Phone 8.1 Update Fixes an Access Violation in "minuser" component which caused WinRT apps and WebViews to crash if scrolled by the user while (or 2–15 seconds after) loading, which was a regression introduced in the 8.1 Update 1 release (8.10.14147.180).
Oct 24, 2017 Windows 10 Mobile: Now you can update your phone from your Oct 23, 2017 Upgrading existing Windows Phone 8.1 devices to Windows 10
Windows 8.1 is an operating system that was produced by Microsoft and released as part of the Windows NT family of operating systems. It was released to manufacturing on August 27, 2013, and reached general availability on October 17, 2013, about a year after the retail release of its predecessor. Windows 8.1 was made available for download via MSDN and Technet and available as a free upgrade
Download Windows 8.1 Update (KB2919355) from Official
Windows Phone 8.1 - Free downloads and reviews - CNET
Windows 8.1 - Wikipedia Windows 8.1 is an operating system that was produced by Microsoft and released as part of the Windows NT family of operating systems. It was released to manufacturing on August 27, 2013, and reached general availability on October 17, 2013, about a year after the retail release of its predecessor. Windows 8.1 was made available for download via MSDN and Technet and available as a free upgrade Windows 10 Mobile RTM Now Available for Windows Phone 8.1 Windows 10 Mobile upgrade is free, if your Windows Phone 8.1 is eligible for the upgrade, you should definitely install Windows 10 Mobile in your device. Btw if you upgrade to Windows 10 Mobile and later you decide to rollback to previous Windows Phone 8.1 operating system, you can do this using Windows Device Recovery Tool . Windows Phone 8.1 (8.10.12397.895) Dev Preview Update