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Tools to Use: Clearing BIOS password

Sunday, 14 October 2007, 17:33 | BIOS, CMOS, Password Crackers, PC Tools, Technology, Tips, Tools, Tricks, Tutorials, Windows | 3 Comments | Read 3884 Times
by Vaibhav Pandey

Unfortunately, many times access to a computer gets blocked. It can happen because of a technical reason like a hardware or software glitch or because of a stupid reason like setting and then forgetting the BIOS password.


The first trick i learnt about clearing BIOS password was way back in 1991, when one of my close friend told me that removing the CMOS battery and then putting it back again after 2 mins clears off the password. Since then, i have practically played with BIOS many a times thereby learning many new tricks to clear off the password.
In this post, i intend to share with you all that i know about clearing the BIOS password and getting access to your computer back.

CMOS Battery

There are practically the following ways to clear BIOS password.

1.) Setting the Motherboard Jumpers ( refer to your motherboard manual to get a detailed description of this.)

2.) Removing CMOS battery. You will have to restore the battery back in sometime. This also forces you to set date and time again.

3.)You can physically remove the BIOS/CMOS PROM chip from the motherboard and send it either to the motherboard manufacturer or a BIOS developer for replacement of flashing. You can also send the entire motherboard to a facility experienced in these operations.

4.)If the motherboard has a flash updateable BIOS/CMOS PROM chip, then you can download a fresh BIOS update and re-flash the PROM to eliminate the password.

5.)Using a Password cracking software to restore the password.

In this post, I will primarily focus on the password cracking part of clearing the BIOS password. Therefore, going forward, let me put down some of the tools which can be used while cracking a BIOS password.

As always, the first step in cracking any password is to guess the password. Therefore, I am putting below a list, which i feel can be used. These are some of the default BIOS passwords used with different BIOS’s, give them a try first.

* Award
* bios
* setup
* cmos
* concat
* AMI_SW (case sensitive)
* j262

If the above mentioned default passwords don’t work :(, you can try out the software tools given below.

KILLCMOS: If you forgot your CMOS password, you don’t have to worry anymore! As long as you are able to boot from the floppy KILLCMOS will remove the password.

NOTE: If you’re running anti-virus software, it may detect a Trojan virus in the killcmos file. This is a mistake. There is NO virus in this file.

Rempass: Rempass is capable of finding and showing BIOS Password, collapse BIOS, save BIOS settings, restore BIOS settings. Rempass comes for a nominal fees of 5USD. There is a free version of the software also available, however, it doesn’t reveal the last 3 characters of the password.

UnAward: UnAward hacks any AWARD BIOS Password in Real Time.

CmosPwd: CmosPwd is a tool which can be used to used to find and reset CMOS password.

Do comment about your experiences with BIOS passwords and let me and the readers know.



Follow me on Twitter at @vaibhav1981
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  • Bibek

    i am unable to remove my bios password.plz send me a free software that helps me to remove bios password

  • jhone

    A. By Using the Motherboard Jumper:

    In most motherboards CMOS battery is soldered, which makes it difficult to remove the battery. In this case we use another method.

    Almost all motherboards contain a jumper that can clear all CMOS settings along with the BIOS password. The location of this jumper varies depending upon the motherboard brand. You should read your motherboard manual to check its location. If you don’t have the manual then look for the jumpers near the CMOS battery. Most of the manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.

    When you find the jumper, look carefully. There will be 3 pins and the jumper will be joining the center pin to either left or right pin. What you need to do, is remove the jumper and join the center pin to the opposite pin. e.g. if the jumper joins center pin to left pin, then remove it and join center pin to right pin. Now wait for a few seconds and then again remove the jumper and join the center pin to left pin.

    Make sure to turn the PC off before opening the cabinet and resetting the jumper.

    B. By Using Software:

    I have found that BIOS/CMOS Password Recovery Tool is the most effective.:
    BIOS/CMOS Password Recovery Tool is a program that works instantly to remove any lost or forgotten BIOS/CMOS password. Simply boot your PC to DOS and execute the program, and get access to forgotten BIOS/CMOS passwords in just seconds

    BIOS/CMOS Password Recovery Tool Service: