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Of note, there is a Linux utility called ms-sys (package ms-sysAUR in AUR) that can install MBR's. However, this utility is only currently capable of writing new MBRs (all OS's and file systems supported) and boot sectors (a.k.a. boot record; equivalent to using FIXBOOT) for FAT file systems. Most LiveCDs do not have this utility by default, so it will need to be installed first, or you can look at a rescue CD that does have it, such as Parted Magic.