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craigstjean/post-bios-update.md

Created March 23, 2025 21:12
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post-bios-update.md

Post BIOS Update

BIOS updates change the boot loader back to Windows and remove GRUB from the boot list. To fix:

  1. Disable Secure Boot
  2. Boot to GRUB Rescue Shell
  3. Execute:
set prefix=(hd5,gpt2)/efi/grub
set root=(hd5,gpt2)
insmod normal
normal
insmod linux
insmod linuxefi
linuxefi /boot/vmlinuz-linux-fsync-nobara-bin root=/dev/nvme1n1p4
initrdefi /boot/initramfs-linux-fsync-nobara-bin.img
boot
  1. Login
  2. Execute:
grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=GRUB
  1. Reboot to BIOS
  2. Update default boot device to GRUB

Notes

This is specific to my machine, where root is (hd5,gpt4), /boot is (hd5,gpt2), and the root device is nvme1n1p4. I am also using the nobara kernel, normally you would reference vmlinuz-linux and initramfs-linux.img

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