For me, a clean install would be to take the Win10 ISO from MS and the Surface drivers, then use that to install the OS on the machine. I don't see how that's possible if you want the free upgrade. I believe once you have Win10 install, there are ways to
reinstall the OS like "refresh your machine" but to me, these aren't a clean install.
I was working with an MS tech prior to trying this so they aren't clear on it as three different people told me it would work and sent me links. Worthless effort. After I told them it failed, he's what they sent me. Maybe it will help you, just not worth
my time to backup, install 8.1, install 10, then reinstall all my apps.
From MS:
This is Christopher form Surface support, Since the SLUI 4 is not working. We need to rollback the Surface Windows to Windows 8.1 and after we need to run the update so that we can get the free Windows 10. Just incase if you cannot rollback to Windows 8.1,
we will download the USB recovery image for Windows 8.1 in the website. Below is the link.
http://www.microsoft.com/surface/en-us/support/warranty-service-and-recovery/downloadablerecoveryimage
Using a Surface USB recovery drive:
To reset your Surface from a USB recovery drive:
| Step 1: |
Make sure your Surface is turned off and plugged in. |
| Step 2: |
Insert the USB recovery drive into the USB port on your Surface. |
| Step 3: |
Press and hold the volume-down button while you press and release the power button on your Surface. |
| Step 4: |
When the Surface logo appears, release the volume button. |
| Step 5: |
When prompted, select the language and keyboard layout you want. |
| Step 6: |
Tap or click Troubleshoot, and tap or click Reset your PC. |
| Step 7: |
If prompted for a recovery key, tap or click Skip this drive at the bottom of the screen. |
| Step 8: |
Tap or click the target operating system you wish to reset. This refers to the current operating system installed on your Surface. |
| Step 9: |
Tap or click Yes, repartition the drives, and on the next page, tap or click<br>Next. |
| Step 10: |
Choose either Just remove my files or Fully clean the drive. <br><br>The option to clean the drive is more secure but takes much longer. For example, if you are recycling your Surface, you should choose to clean the drive. If you are keeping your Surface, you just need to remove your files. |
| Step 11: |
Tap or click Reset. <br><br>Surface restarts and the Surface logo displays while the reset process continues (this can take several minutes). |