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You can enter a valid product code manually and it will activate and show as genuine. The other scenario is they modified it to use the Dell OEM-SLP. That would be illegal. This utility should tell you what is going on. Showkey - Windows 10 Forums If it shows OEM marker in the firmware, they illegally modified it to cheat activation. Or if you see a grub boot loader installed, that's another tip off that something isn't on the up and up.