- BIOS stands for "basic input/output system" and is the program on your computer that makes sure all the components from your operating system to your central processing unit (CPU) to your RAM and everything in between all functions together as one unit.
- The main thing your BIOS does when you turn on your computer is load your operating system. Your operating system is what controls the majority of the processes your computer runs, but it could not do that without the BIOS loading it first.
- When you start your computer, the Central Processing Unit (CPU) tries to execute its first instruction; it has to get the instruction from somewhere. It can't get it from the operating system because the operating system is located on a hard drive, the CPU can't get to it without some instructions that will tell it how. The CPU sends control of the PC to the BIOS routine.
FOLLOW THE LINK TO UNDERSTAND THE WORKING OF BIOS
HERE ARE FEW METHODS TO BYPASS BIOS PASSWORD
NOTE : IT IS NOT NECESSARY THAT THESE METHODS WILL WORK ON ALL BIOS. YOU HAVE TO KNOW THE NAME OF YOUR BIOS MANUFACTURER FOR BETTER CRACK.
METHOD 1
- Open command prompt & type - "DEBUG".
You will get a - prompt where you can type the fOllowing (<enter> means hit enter, not type enter*)
A <ENTER>
MOV AX,0 <ENTER>
MOV AX,CX <ENTER>
OUT 70,AL <ENTER>
MOV AX,0 <ENTER>
OUT 71,AL <ENTER>
INC CX <ENTER>
CMP CX,100 <ENTER>
JB 103 <ENTER>
INT 20 <ENTER>
<ENTER> just hit enter on this line
G <ENTER>
Q <ENTER>
METHOD 2
- This password hack clears the BIOS such that the next time you start the PC, the CMOS does not ask for any password. Now if you are able to bring the DOS prompt up, then you will be able to change the BIOS setting to the default.
- To clear CMOS, Open CMD & Type --> "DEBUG". Type Next...
-o 70 2e <enter>
-o 71 ff <enter>
-q <enter>
exit <enter>
Restart the computer. It works on most versions of the AWARD BIOS.
METHOD 3
- When you turn on the host machine, enter the CMOS setup menu (usually you have to press F2, or DEL, or CTRL+ALT+S during the boot sequence).
- Now go to STANDARD CMOS SETUP, and set the channel to which you have put the hard disk as TYPE=Auto, MODE=AUTO, then SAVE & EXIT SETUP. Now you have access to the hard disk.
This information is intended for experienced users. It is not intended for basic users, hackers, or computer thieves. Please do not try any of following procedures if you are not familiar with computer hardware.
METHOD 4
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 (30 secs) and then again remove the jumper and join the center pin to left pin.
METHOD 5
Cracking By Means of Software.
- 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.
- Other Password Recovery Programs are - REMPASS & KILLCMOS. Keep in mind that if you are unable to boot the PC from a floppy disk, you will be unable to use these programs. Additionally, since the software does not come from the BIOS manufacturer, you will be using it at your own risk.
By Setting up Backdoor BIOS Password
Each motherboard manufacturer has set a backdoor password in order to facilitate the provision of technical support. The backdoor password is a BIOS password that works, no matter what the user sets the BIOS password to.
- AMI Backdoor BIOS Passwords
Reported AMI backdoor BIOS passwords include -->
A.M.I., AAAMMMIII, AMI?SW , AMI_SW, BIOS, CONDO, HEWITT RAND, LKWPETER, MI, and PASSWORD.
- Award Backdoor BIOS Passwords
One reported Award backdoor BIOS password is "eight spaces".
Other reported Award backdoor BIOS passwords include -->
01322222, 589589, 589721, 595595, 598598 , ALFAROME, ALLY, ALLy, aLLY, aLLy, aPAf, award, AWARD PW, AWARD SW, AWARD?SW, AWARD_PW, AWARD_SW, AWKWARD, awkward, BIOSTAR, CONCAT, CONDO, Condo, condo, d8on, djonet, HLT, J256, J262, j262, j322, j332, J64, KDD, LKWPETER, Lkwpeter, PINT, pint, SER, SKY_FOX, SYXZ, syxz, TTPTHA, ZAAAADA, ZAAADA, ZBAAACA, and ZJAAADC.
- Phoenix Backdoor BIOS Passwords
Reported Phoenix BIOS backdoor passwords include -->
BIOS, CMOS, phoenix, and PHOENIX.
- Backdoor BIOS Passwords from Other Manufacturers
Manufacturer | BIOS Password |
VOBIS & IBM | merlin |
Dell | Dell |
Biostar | Biostar |
Compaq | Compaq |
Enox | xo11nE |
Epox | central |
Freetech | Posterie |
IWill | iwill |
Jetway | spooml |
Packard Bell | bell9 |
QDI | QDI |
Siemens | SKY_FOX |
SOYO | SY_MB |
TMC | BIGO |
Toshiba | Toshiba |
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