Hi k3koffer,
I am Dave, I will help you with this.
The AMD FX processors were released between 2011 and 2014 and they would not have the security requirements for Windows 11, while it is possible to install Windows 11 on an unsupported processor, honestly on a processor from that era, it would be best not to, your hardware is not strong enough for Windows 11.
Microsoft provide the required registry fix to bypass that requirement on the link below, but they do warn you that they will not be responsible if things go wrong or if your hardware is affected.