Methods of breaking password for Desktop PC and for laptop is quite different.
Break BIOS Password for Desktop :
If it's a desktop PC, erasing the cmos memory will usually clear it.
Steps:
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 and leave it out for about 120- 180 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.
Other Method: (Its Tricky)
Remove a jumper:
There's a jumper on your motherboard that you'll need to identify and remove. Most motherboards make your job easier by actually labeling the correct jumper as "BIOS config" or something similar. (it looks like a small plastic thingy on 2 pins with 1 pin beside it, within a 1" of the battery). If you're having trouble looking for it, look in the motherboard manual.After you have found it, carefuly pull straight up on it, and place it on the 2-3 pins(it was on the 1-2 pins). With the battery removed and the jumper moved, turn the computer on, and check to see if you can get into the bios. If you are able to, turn the computer off, put the jumper back on pins 1-2, and put the battery back in. Lastly put the case together and you are done.
Note: Don't forget to configure the BIOS (if you know how) after this process. If you you don't know how, just hold the "delete" button when starting your PC and when the blue screen appears, find the load safe defaults settings and press:
* ENTER button* Y button* F10 button
Break or Reset BIOS Password for Laptop :
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:
1. Create a Win98SE bootable media "or anything that lets you boot into MS-DOS" and boot off of it.
2. When the A:\> prompt appears type debug and press enter.
3. You will then only see a "-".
4. Type o 70 2E "include the spaces" and press Enter.
5. Type o 71 ff "include the spaces" and press Enter.
6. Type q and press Enter.
7. Here are a list of common mfg backdoor passwords
* AWARD BIOSAWARD 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,* AMI BIOSAMI, A.M.I., AMI SW, AMI_SW, BIOS, PASSWORD, HEWITT RAND, order
Softwares to Break BIOS Password:
If your system boots but the BIOS password is still in place, there are several programs you can load that are designed to crack the passwords or clear them altogether. The encryption on BIOS passwords is not very complex. Following are links to a few of these free programs:
1. CmosPwd 4.8
http://www.softpedia.com/get/Security/Decrypting-Decoding/CmosPwd.shtml
CmosPwd works and compiles under Dos-Win9x, Windows NT/W2K/XP/2003, Linux, FreeBSD and NetBSD.
Typical Usage for DOS and all Windows users:
1) Identify your BIOS manufacturer (usually displayed at boot-up)
2) Start in DOS, or start a DOS session in Windows 95/98/ME. For Windows NT or Windows 2000 boot from a DOS or Windows 95/98 boot disk and run CMOSPWD from your boot floppy (or another floppy).
3) C: [Enter] cd CMOSPWD [Enter]
4) Type CMOSPWD at the DOS prompt and press Enter.
5) CMOSPWD will display a list of possibilities. Use the possibilities itemised against your BIOS manufacturer. Remember :
a) For AWARD BIOSes, use the Numeric Keypad (with NumLock ON).
b) AWARD 4.50PG BIOS always accepts "AWARD_SW", or "d8on", or "589589".
c) Old Phoenix BIOSes will accept "phoenix".
6) If the standard method does not work, then try to kill the CMOS password with CMOSPWD /K (and press Enter), and then see if you can get into the CMOS without a password. If you can, you successfully "killed" the old CMOS password. DO NOT KILL THE CMOS ON LAPTOPS!On laptops, the password is usually stored in an eeprom on the motherboard,you need an eeprom programmer (electronic device) to retrieve it.
Works with the following BIOSes-
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
