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Fedora installs GRUB, a bootloader, to the MBR. Changing the default boot entry isn't 'fixing the MBR' - nothing is broken here. https://fedoraproject.org/wiki/GRUB_2 has the information you need, but I'll summarize below. You'll need to open a terminal and run these commands, one at a time:

  • get an admin session - be careful now!

    su -

  • update your software - this will probably take a while.

    yum upgrade

  • list options

    grep ^menuentry /boot/grub2/grub.cfg | cut -d "'" -f2

  • Choose your default entry

    grub2-set-default <menu entry="" title="">

  • Make sure it worked!

    grub2-editenv list

If you still have freezing issues after the update, or if you cannot update, it would be best to open a new, topical question. One issue per question makes support less confusing :)

Fedora installs GRUB, a bootloader, to the MBR. Changing the default boot entry isn't 'fixing the MBR' MBR' - nothing is broken here. https://fedoraproject.org/wiki/GRUB_2 Fedora's GRUB 2 Wiki has the information you need, but I'll summarize below. You'll need to open a terminal and run these commands, one at a time:

    1. get an admin session - be careful now!

      # su -

      -
    2. update your software - this will probably take a while.

      # yum upgrade

      upgrade
    3. list options

      # grep ^menuentry /boot/grub2/grub.cfg | cut -d "'" -f2

      -f2
    4. Choose your default entry

      # grub2-set-default <menu entry="" title="">

      entry title>
    5. Make sure it worked!

      # grub2-editenv list

list

If you still have freezing issues after the update, or if you cannot update, it would be best to open a new, topical question. One issue per question makes support less confusing :)