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New Latitude 3550 with Win 8.1 Pro to Win 10 Pro

Just bought a couple of Latitude 3550 laptops with Win 8.1 Pro installed that I want to upgrade to Win 10 Pro.

I noticed after I received, that they didn't have internal DVD drives, so I picked up an external DVD drive to use my Dell supplied Windows 10 Pro installation DVD. However, I can't quite figure out how to install from it? I don't seem to be able to boot from the DVD for some reason, and when I access the DVD through Win 8.1, there is no way to start an install?

I had read that if you had an ISO of the install DVD that you should be able to double click from within Win 8.1, but that just mounts and opens the image.

I know that I can do the upgrade online, but I was hoping to avoid the 3 GB download.

Can anyone offer suggestions?

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RE: New Latitude 3550 with Win 8.1 Pro to Win 10 Pro

Finally got through on a chat and got an answer. Would never have guessed this!

How to Install Windows 10 from a Dell Windows 10 DVD

Look in BIOS , if shipped with W7 it is most likely in Legacy mode

  1. Boot from the DVD (F12 Menu) (Legacy Option > DVD)
    Note: You may experience a delay (1 to 5 minutes) to boot to the Dell Screen with Spinning Circles.
  2. Choose English
  3. Choose US
  4. Choose Troubleshoot
  5. Choose Advanced
  6. Choose Command prompt
  7. In the Command Prompt Window, enter the Command: "diskpart" > Enter
  8. Next Command: "list disk"
  9. Then: "select disk 0" (0 being the hard drive where the OS should be installed if there are multiple drives)
  10. Type "clean"
  11. Type "convert GPT"
  12. Type "exit" (2 times)
  13. Power down the System
  14. Restart the system tapping F12 for the BIOS
  15. Change the Boot List Option from Legacy to UEFI with Legacy Option ROMS "Enabled"
  16. Navigate to Exit and "Exit Saving Changes"
  17. Reboot F12
  18. Choose UEFI DVD boot option
  19. Dell Screen
  20. Note: You may experience a delay (1 to 5 minutes) to boot to the Dell Screen with Spinning Circles.
  21. Choose English
  22. Choose US
  23. Choose Troubleshoot
  24. Choose Recover from a drive
  25. Choose either "Just remove my files" or "Fully clean drive "
  26. Dell screen - will show recovering this PC XX%
  27. Reboots to W10 when finished

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