The Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI replaces the Basic Input/Output System (BIOS) firmware interface. With all the advantages, it is appears to be more volatile and fragile for multiple boot system. I found it is easily to lose the bootloading info when you make some changes in bios setting (esp. secure boot) or by disconnect the bios chip battery. I ...
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