Joined: 30 Apr 2008
Location: Shanghai, China
Legacy BIOS used the CMOS RAM to store the user and admin passwords, but UEFI BIOS will store the user and admin passwords into the BIOS ROM. So if you clear the CMOS RAM, it doesn't affect the user and amin passwords in the UEFI BIOS.
I think that the machine after 2005 should use UEFI BIOS now.
Kenneth Zheng is right. Recently I tried to erase the whole cmos in 3-years old laptop and it did not help, a supervisor password set on manufacturing persisted - I suppose in nvram.
This site helped me at the end:
Then I was able to enter uefi setup and enable locked laptop features.
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