Question Can't change Windows 10 Pro product key

Apr 13, 2019
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Having an issue with a Windows 10 Pro activated by Microsoft Toolkit and KMSpico. I have used them both... I don't really know which is present on the system.
So lately I bought a product key. But I can't activate it, and the old key (provided by the activator) always becomes present. I've tried:
  • using slmgr
    • /upk
    • /cpky
    • /rearm
  • Removing the key through the activator's options
  • Reinstalling the system with the disk image provided by Microsoft (even offline)
    • Changing the PID.txt and EI.cfg
  • Putting another hard drive in the computer
  • Updating the BIOS
I know some of these may seem unnecessary but I'm really desperate. Where is the product key stored? How can I change it? Because most of the online results didn't solve my problem.
 
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