You can create the initrd manually like % /sbin/mkinitrd -k vmlinuz-5.9.... -i initrd-5.9.... where 5.9.... is the file name of /boot/vmlinuz-* corresponding to the Fedora kernel you've installed. Once after mkinitrd succeeded, the update GRUB entry like % /sbin/update-bootloader --add --image /boot/vmlinuz-5.9.... --initrd /boot/initrd-5.9.... % /usr/sbin/grub2-mkconfig -o /boot/grub2/grub.cfg Then reboot with that kernel with fingers crossed.