==== pendejo MBR → cru4sys GPT ====

mount cru4sys
  mount /dev/sdc3 /mnt/cru4

backup system
  rsync --dry-run --delete --itemize-changes --exclude /etc/fstab --exclude /home --exclude /mnt --exclude /dev --exclude /proc --exclude /run --exclude /sys --archive --hard-links --acls --xattrs / /mnt/cru4/

  
edit ''/mnt/cru4/boot/loader/entries'' newly installed kernel , to add ''/boot'' to path before kernel (linux) and initrd and UUID=cru4sys
  vi /boot/loader/entries/$(cat /etc/machine-id)-$(uname -r).conf

troubleshoot
  efibootmgr
  mount --bind /dev /mnt/cru4/dev
  mount --bind /proc /mnt/cru4/proc
  mount --bind /run /mnt/cru4/run
  mount --bind /sys /mnt/cru4/sys
  mount --bind /sys/firmware/efi/efivars /mnt/cru4/sys/firmware/efi/efivars/
  dnf reinstall grub2-efi shim

 
==== grub ====

files:
  * /etc/default/grub
  * /boot/grub2/grub.cfg
  * /etc/fstab

  grub2-mkconfig
  
rebuild/bootloader install
  drvpath=/mnt/drv
  mkdir /mnt/drv
  mount /dev/sdXroot $drvpath
  mount /dev/sdXboot $drvpath/boot
  
  mount --bind /dev  $drvpath/dev
  mount --bind /sys  $drvpath/sys
  mount --bind /proc $drvpath/proc
  
  chroot $drvpath
  grub2-install /dev/sdX
  # regenerate drivers
  dracut --regenerate-all --force
  
  exit
  
  umount $drvpath/dev
  umount $drvpath/sys
  umount $drvpath

==== plymouth ====

  dnf list plymouth-theme-*

get active theme
  plymouth-set-default-theme

set active theme (-R or --rebuild-initrd)
  plymouth-set-default-theme spinner -R