I saw this post on the Windows 10 Forums and will try it soon when I get my RVE.
Quote Originally Posted by DJG View Post
"I just now went through the MB change adventure, as my previous one got fried by the PS. As I understand it after talking to MS Support when the new MB did not activate, when you upgrade the equivalent of the key is based on the current MB. Change that, even for same MB model, and you're no longer activated. So what I ended up doing which worked great is:
1. Made an image of my current Win 10 system drive (I have a 2-SSD raid 0), which wouldn't activate but Win 10 was fully functional.
2. Restored my last Win 8.1 image and let it activate the new MB (it activated after the second reboot).
3. Did a base upgrade of the old 8.1 to Win 10 with the media-tool-created ISO.
4. When the upgrade was finished and Win 10 was activated, I restored my current Win 10 image.
5. My up-to-date Win 10 image was then activated.
Life is good again."