Tuesday, January 13, 2009

Need to access your BIOS but don`t have the password?, use CmosPwd

CmosPwd can crack, backup and restore BIOS passwords, you can even kill/clear the Cmos if cmospwd can`t crack the bios. There are several ways of using Cmospwd but the one i found the most simple and straightforward was to simply create a DOS boot disk and run it from there since if you want to run cmospwd from windows you have to install a potentially dangerous driver.

Here`s a small tutorial:

1.- right click on the portable device that you want to use as a DOS boot disk, it can be a usb flash drive or a floppy disk but i had to use a floppy disk since my BIOS wasn`t configured to boot from an USB device.

2.- select the format option , then from the window that appears check the "Create an MS-DOS startup disk" and click start.

3.- Download the cmospwd zip and extract it, then enter the new created folder and look for another folder called DOS, copy this folder to your newly created MS-DOS startup disk (I copied the whole cmospwd-5.0 folder but this should work too).

4.- Reboot your computer and pay extra attention as to what kind of BIOS you have, look for the BIOS word and the word right beside it, write the BIOS name and write it down since you will be needing that later.

5.- The DOS interface should start automatically from MS-Dos disk you have created.

6.- A prompt should appear , now simply type CD DOS and the prompt should change into something like A:\DOS: , then type cmospwd and the program should start.

7.- CmosPwd will show a long list of names, these are the different types of BIOS it can handle, locate your BIOS name on the list and write down the symbols that appear on the right side.

8.- Now once you are at the prompt again type cmospwd then / and finally the symbols that belonged to the name of your BIOS.

9.- Finally it will show the commands that it can do like backup,restore, Etc. however if you don`t wanna do all those things or find them too complicated just type cmospwd / K this will attempt to clear the BIOS erasing the password, however keep in mind that this will also erase all of the BIOS settings that are critical to the functioning of your computer so you will probably want to enter the BIOS and load the optimal values so that you can keep using your PC.

CmosPwd is a great program that just helped me in getting rid of my nagging BIOS password that i had been trying to bypass for years, i definitely recommend it. Available for Windows DOS/98/NT/W2K/XP/2003 and linux.

Works with the following BIOSes
  • 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

Get it at http://www.cgsecurity.org/wiki/CmosPwd

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