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How to Install ChromeOS on Legacy BIOS: A Guide to the MBR Support Patch

Why Do You Need MBR Support?

Typical purpose: A compressed tarball (tar.gz) named by a vendor or community to provide tools, scripts, drivers, or support files related to MBR (Master Boot Record) repair, migration, or compatibility utilities.
Common contexts: Linux/Unix support packs, firmware or bootloader utilities, OEM support archives, rescue toolkits, or community-created recovery scripts.

Restoring a Saved MBR

sudo dd if=backup-mbr.bin of=/dev/sda bs=512 count=1

wget https://ftp.gnu.org/gnu/grub/grub-2.06.tar.gz
# Extract and look into ./grub-core/boot/i386/pc/

Conclusion