How to update any WP device to Windows Phone 8.1 Update (GDR1) Fully

Guest writer Nico brings us another guide, this time to help bring Lumias on Windows Phone 8.1 up to '8.1 Update 2', otherwise known as 'GDR2'. Geeky? Yes.

Instead of waiting over a year to add new features to Windows Phone 8, Microsoft opted to release three incremental updates to its existing mobile OS. These updates are delivered with corresponding firmware updates for the specific devices.

The Universal Updater allows you to update a connected Windows Phone device directly or by updating an FFU firmware file and then flashing it to the device. The updated FFU will perform a hard reset on the first boot. You can skip intermediate builds and

本文說明如何將符合資格的 Windows Phone 8.1 裝置升級至Windows 10 行動裝置版。 請參閱 如何判斷裝置是否可升級一 節，以判斷您的裝置是否符合更新資格。

Windows Phone 8.1是微软公司于2014年发布的一款操作系统，它为Windows Phone带来了许多新功能和改进。 本文将详细指导您如何轻松升级到Windows Phone 8.1，并介绍一些常见问题及解决方法。