Fedora works with secure boot, it shouldn’t need to be disabled.

Do you have more than 1 disk in the computer? Either way, check bios for a disk setting called Intel RST. If you see that, change it to AHCI, save and reboot.

Routers sometimes have security issues that need to be patched. You should keep an eye out for bulletins and make sure your endpoints have host-based security where they can (antivirus and firewalls).

This is a big fuck you from netgear though -why would you purchase another netgear router when they could just decide not to support the next model and force you to upgrade again for more money?