How to activate Windows 7 with a key sewn into the BIOS on Windows 8.1?

Question

Windows

Good afternoon. The crux of the matter, I bought a system unit with Windows 8.1 pre-installed, I didn’t like it, I decided to install the good old Windows 7 for myself, well, I decided to activate it using the activator downloaded on the Internet, but none of the activators worked because I had it in Bios, I I understand that the activation key is wired to another version of Windows. How can I activate a new OS?

Answer 1

flash BIOS? :)

Answer 2

There are a lot of articles on the Internet on this topic, search by the keyword SLIC (Software Licensing Description Table).
for example