March 18 this year, Lumia 1520, including 18 of the WP 8.1 bare usher Windows 10 Mobile system update, after a lapse of two and a half months since Microsoft announced today to join US carriers to push updates to Windows 10 Mobile system operators edition devices, currently AT & amp; T and Verizon's Lumia 640 Lumia 735 system update is already on the line.
But despite this update already on the line, but the traditional way differ. Microsoft did not like most of the OTA upgrade, like to remind the user can obtain the new version support. And consumers will not receive a new version of the system can be upgraded reminder. All eligible equipment (including AT & amp; T's Lumia 640 and Verizon's Lumia 735) must first install Microsoft's Windows 10 Upgrade Advisor application, you can find a user guide here, and then allowed to install a new system update.