I recently purchased a refurbished HP laptop that came with Windows 10 Pro installed and has a "WINDOWS 10 PRO FOR REFURB PCS" product key sticker. I then installed an SSD into the laptop and did a clean install of Windows 10 using an ISO image downloaded from Microsoft. However, the new install of Windows 10 automatically activated itself with a Windows 10 *Home* key that is apparently embedded in the laptop's BIOS.

Is there any way to get back to Windows 10 Pro using the product key on the sticker? I already tried following [Microsoft's directions](https://support.microsoft.com/en-us/help/12384/windows-10-upgrading-home-to-pro) by entering that key in the Activation page of Settings, but Windows says it is invalid.

Answers to [a different question](https://superuser.com/questions/1020961/prevent-windows-10-installer-from-using-the-preinstalled-serial-key-without-disa) state that with a *retail* Windows 10 Pro key, one can modify the installer ISO to use that key automatically, and it will take precedence over the key in the BIOS. This is a possible solution, but one which I have not had time to try yet.

The answer I am looking for is a solution that is specifically known to work with a refurbisher's product key. If you don't know of such a solution, then simply leave the question unanswered. I am not looking for more suggestions of "try reinstalling this way, maybe it will work".