From Fedora Project Wiki
Raspberry Pi5
Inoffical procedure:
- Go to the RPM Fusion link https://rpmfusion.org/Howto/RaspberryPi
- Find the Fedora 40 (or 39) download (you’ll need to pick between Workstation and Server, haven’t tested server though)
- Install it using
sudo dnf install rpi-imager - Put the SD card in your Pi 5, and voila!
source by @kilobyte: https://discussion.fedoraproject.org/t/i-got-fedora-40-working-on-my-raspberry-pi-5/120319/3