Reversing Fn key - Logitech Keyboard K290
Solution 1:
For anyone else that stumbles upon this question. SetPoint now includes a checkbox that enables you to change the default setting back to using F1-F12 instead of media keys:
Solution 2:
For all the people still wondering how to do this on Linux, here is the link to the solution:
https://github.com/milgner/k290-fnkeyctl