I bought 8 new inspirons from dell outlet and I manually reinstalled a fresh copy of windows 8.1 on one and then upgraded to windows 10. Then I took an image of that and imaged it to the remaining 7. For some reason, 4 of them worked fine and on 3, windows is not activated.
I was advised by a peer that the product key is in the bios and windows should have automatically pulled it from there. Since there's no sticker with product keys, what should I do to get these windows to activate?