How to Break a BIOS Password

Have you ever been locked out of an old computer by a forgotten BIOS password? There's no need to get frustrated. It is relatively easy to bypass this safeguard.

Step

Desktop

1. Power off the computer and make sure that it is unplugged.
2. Open up your computer case. You need physical access to the motherboard to complete this procedure.
3. 
   Find a circular, (mostly) silver metallic object on the motherboard. This is the CMOS battery.
4. CAREFULLY remove the CMOS battery, avoid touching it with your fingers, and leave it out for about 700 seconds. This will flush the CMOS memory which stores the BIOS password and all other configuration. (See Warnings)
5. Set the battery back into place and power on the computer.
6. The computer should then warn you that the CMOS configuration could not be found. You can either reconfigure it yourself or restore defaults. Restoring the default configuration should be fine.
7. You will notice that the BIOS password has been cleared and you can boot without it. You may reset the BIOS password to something else by going into the BIOS configuration and setting a new User Password (The Supervisor Password controls access to the BIOS, NOT the computer!)

Laptop

1. Remember that laptops can be trickier, especially if it's a newer model. If it has a security chip on the motherboard forget about it. You either have to physically remove the chip or contact the mfg for the "master" password. If you can boot up off of a cd or floppy try any of these methods:
2. Create a Win98SE bootable media "or anything that lets you boot into MS-DOS" and boot off of it.
3. When the A:\> prompt appears type debug and press enter.
4. You will then only see a "-".
5. Type o 70 2E "include the spaces" and press Enter.
6. Type o 71 ff "include the spaces" and press Enter.
7. Type q and press Enter.
8. Here are a list of common mfg backdoor passwords:
   • AWARD BIOS
     • AWARD SW, AWARD_SW, Award SW, AWARD PW, _award, awkward, J64, j256, j262, j332, j322, 01322222, 589589, 589721, 595595, 598598, HLT, SER, SKY_FOX, aLLy, aLLY, Condo, CONCAT, TTPTHA, aPAf, HLT, KDD, ZBAAACA, ZAAADA, ZJAAADC, djonet, %øåñòü ïpîáåëîâ%, %äåâÿòü ïpîáåëîâ%
   • AMI BIOS
     • AMI, A.M.I., AMI SW, AMI_SW, BIOS, PASSWORD, HEWITT RAND, Oder
9. Other passwords you may try (for AMI/AWARD or other BIOSes) - LKWPETER, lkwpeter, BIOSTAR, biostar, BIOSSTAR, biosstar, ALFAROME, Syxz, Wodj gvs

. 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: http://www.biospasswordrecovery.com/