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Boot into Live disk/usb and chroot into your Fedora installations as documented in this https://docs.fedoraproject.org/en-US/quick-docs/bootloading-with-grub2/#restoring-bootloader-using-live-disk[Fedora Quick-docs Article]
following steps depends of your File System `LVM/BTRF/LUKS`.
Unlock root account by supplying password for it:
passwd root
Exit chroot environment with [Ctrl-d] or
exit
Reboot your computer with GUI or with
systemctl reboot