Resetting the BIOS Password using Software
Every system must store the BIOS password information somewhere. If
you are able to access the machine after it has been booted
successfully, you may be able to view the BIOS password. You must know
the memory address where the BIOS password is stored, and the format in
which the BIOS password is stored. Or, you must have a program that
knows these things.
You can write your own program to read the BIOS password from the
CMOS memory on a PC by writing the address of the byte of CMOS memory
that you wish to read in port 0x370, and then reading the contents of
port 0x371.
!BIOS will recover the BIOS password for most common BIOS versions, including IBM, American Megatrends Inc, Award and Phoenix.
CmosPwd will recover the BIOS password for the following BIOS versions:
- ACER/IBM BIOS
- AMI BIOS
- AMI WinBIOS 2.5
- Award 4.5x/4.6x/6.0
- Compaq (1992)
- Compaq (New version)
- IBM (PS/2, Activa, Thinkpad)
- Packard Bell
- Phoenix 1.00.09.AC0 (1994), a486 1.03, 1.04, 1.10 A03, 4.05 rev 1.02.943, 4.06 rev 1.13.1107
- Phoenix 4 release 6 (User)
- Gateway Solo - Phoenix 4.0 release 6
- Toshiba
- Zenith AMI
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