How to install W10 Mobile (build 10240) on Lumia 930, 640, and 640XL

This post contains a very simple guide on how to install Windows 10 Mobile on Lumia 930, 640 and 640L. Download links to the flashable roms are also available here.


  • *Windows Phone Image Designer (needed for flashing ROM) – Download

Disclaimer: Your use of this guide is strictly at your own risk. If any goes with your device, you are entire responsible for it, I or Leakite will not be held responsible.

Please make a backup of your current rom before you proceed.

Flashing guide
Step One: Download your device ROM from links provided above.

Step Two: Download Windows Phone Image Designer (link above).
Step Three: Power off your device and boot into UEFI mode by holding down Volume up button (a lightening bolt icon should display on your screen)
Step Four: Connect your device to PC and open Windows Phone Image Designer folder. Select the x86 folder or the x64 folder (depending on your windows version).
Step Five: Run the Start.bat file and Windows Phone Image Designer will launch.Step Six: Now select Flash a Windows Phone image onto your phone and click Next.

Step Seven: Your device should show up under flashable devices. Click on Change, then select the downloaded ROM

Step Eight: Hit Flash and wait for the flashing process to complete

Step Nine: Once flashing process is complete, your phone will reboot and build 10240 must have successfully installed on your device.




  1. HARI May 10, 2017
    • Leakite May 10, 2017
  2. Collins Edim May 6, 2016
  3. Collins Edim February 20, 2016
  4. Unknown February 20, 2016

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