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A Mac's "BIOS" is not really a BIOS. It is OpenFirmware, which many Mac users find to be better than BIOS. To access OpenFirmware, you must use two hands on the keyboard and the key combination CMD-OPT-O-F.
The delete key is also used to access bios on some systems.
By pressing certain keys (depending on the specific computer and BIOS program) during the boot process, ex: F12, F2, F8,
try to press alt f10
In the BIOS setup program.
The BIOS Manufacter
FN + F1 > together
how du i unlock tuch mat tab to screen lock
Assuming you mean "flash the CMOS", when the CMOS settings are so messed up, you cannot access the BIOS.
The Del key