Microsoft recently released the preview build of Windows 10 OS for mobile phones. However, not all the Lumia smartphones supports the Windows 10 preview build. The smartphones which officially supports the Windows 10 OS preview build are Lumia 635 / 630, Lumia 735, Lumia 636 and Lumia 830. According to the Microsoft, more devices will receive the same. However, in case you don’t want to wait till the official release for your Lumia device, then here is how to install Windows 10 OS (for Mobile) on Lumia 930, Lumia 920, Lumia 1520 and Lumia 520.
How to Install Windows 10 on Nokia Lumia 930, 920, 1520, 520 Devices
Note: Follow this steps at your own risk, involves risk of bricking your device.
Step 1: Create full backup of data and reset your Lumia smartphone. Follow this guide to reset / restore Windows Phone Lumia devices using Windows Phone Recovery Tool.
Step 2: Next, follow this Windows Insider Program link and signup for Windows Insider Program.
Step 3: Now, download and install Windows insider app on your phone.
Step 4: Launch the app, and go to About options in the app and note down or email the settings to yourself.
Step 5: Download and run the WPInsiderHacks app on your computer. Launch the app and allows firewall requests if asked.
Step 6: Now connect your smartphone to same WiFi network, that your PC is connected. Now edit the WiFi connection settings, turn on Proxy and set it to use the PC’s IP address. For port number enter, 8877 as port.
Step 7: Open Internet Explorer on your Lumia smartphone, and enter your PC’s IP address followed by the port number.
Step 8: Tap on the link at the bottom to the fiddler root certificate.
Step 9: Next, click on Open, then install to trust the certificate and OK for confirming it.
Step 10: Run the Windows Insider App on your smartphone and tap on get preview builds.
Step 11: Now it will ask you select the custom action that you would like to perform. Select ” Set to Lumia 635″ and click on arrow button at the bottom.
Step 12: Next, accept the agreement and click the check mark at the bottom.
Step 13: Next, clear your proxy settings and run the insider app again.
Step 14: Tap on get preview build and sign in with your Microsoft account.
Step 15: Select fast branch and click the arrow at the bottom.
Step 16: Now go to Settings and check for updates. If everything went right, then you should see Windows 10 update displayed as available to install.
That’s it. Install the update and with the next start you should reboot Windows 10 OS for Mobile phone on your Lumia devices.