These phones are supported if they have 8 GB of storage or more, and if they originally shipped with Windows Phone 8.1 installed on them.We're excited to announce that Windows 10 is being made available to the following Lumia smartphones running Windows Phone 8.1 Denim: Lumia 1520, Lumia 930, Lumia 830, Lumia 735, Lumia 730, Lumia 640 XL, Lumia 640, Lumia 638 (1 GB RAM), Lumia 636 (1 GB RAM), Lumia 635 (1 GB RAM), Lumia 540, Lumia 535, Lumia 532, Lumia 435, and Lumia 430. Download the Windows 10 Upgrade Advisor app – available free in the Windows Store – where you can easily check for upgrade availability and begin the upgrade in just a few easy steps.This update provides features and improvements: Your software is up to date. Note: Software version 8.10.10328.78 was mistakenly released to a small number of devices.It contains no additional features or improvements over 3030.0.33501.531.All you need is a developer account and a simple app install and you’re set to go.If you just can’t wait to get the new trace keyboard, notification center, those new home screen customizations or Microsoft’s Cortana personal assistant, follow the instructions below and you’re HTC phone will be running Windows phone 8.1 Preview in no time. The download and installation process took roughly 20 minutes on our Verizon branded HTC 8X.This trick only works if the Windows Insider Preview program — and Windows 10 itself — will support your Windows phone.Microsoft provides a list of phones that support the preview program here.
You even get familiar, rich formatting and layout options, while your files stay in sync across all your devices on One Drive.
The Insider Program lets you upgrade to Windows 10 and immediately jump off the preview builds, sticking to the stable builds.
Warning: As Microsoft itself will warn you, this process isn’t designed for average users and may not be completely stable. Microsoft’s Windows Device Recovery Tool can help you reset your phone’s software if you encounter a problem, but it doesn’t work for all Windows phones.
And with Windows 10 on Lumia, you'll always have the latest new features, since updates are sent to your phone automatically.
Discover a better way to experience the all new Office and Outlook Mail.