BIOS Password Removal

Some Users forget BIOS password or some may purchase computer from a friend and he is out of country, here are some steps to reset password.

Reset BIOS password using Hardware(two methods)

  1. a) Reset BIOS password removing CMOS battery
  2. b) Reset BIOS password using Jumper

Reset BIOS password using DOS

Reset BIOS password using Software

Reset BIOS password using Backdoor BIOS Password

Reset BIOS password using Hardware

cmos_jumper

Two methods: first is by removing CMOS battery, second by jumper in motherboard. Many of the desktop computers motherboard has a small coin sized CMOS battery. They store password and other settings. Once CMOS battery is removed the entire password and settings are lost and they are reset to factory defaults.

Reset BIOS password removing CMOS battery

Step 1 power off your computer and unplug power cable.

Step 2 open computer cover.

Step 3 locate coin sized battery.

Step 4 using flat screw driver push the battery lock to lift battery.

Step 5 remove battery and wait for half an hour to discharge.

Step 6 fix back battery, computer cover and power cable and power on computer.

Step 7 you will get CMOS checksum error and the settings will be restored to factory defaults.

Step 8 go to ths BIOS setup program by pressing F2 or delete or as per brand it varies and save settings . now your computer is without password.

Reset BIOS password using Jumper

Some desktop computers come with CMOS battery soldered to its motherboard. Use the jumper to clear settings.

Step 1 power off your computer and unplug power cable.

Step 2 locate the jumper as labeled as CLR, CLEAR, CLEAR CMOS, etc shown in the figure above. The location varies from computer to computer brands.

Step 3 there will be either 3 or 2 pins, if it is 2 pins insert the jumper in those 2 pins, if it has 3 pins remove the jumper and join the center pin to the opposite pin. If the jumper joins center pin to left pin, then remove it and join center pin to right pin or vice versa.

Step 4 wait for few seconds and re fix the jumper to its original position

Step 5 you will get CMOS checksum error and the settings will be restored to factory defaults.

Step 6 go to ths BIOS setup program by pressing F2 or delete or as per brand it varies and save settings . now your computer is without password.

Reset BIOS password using DOS

Step 1 create a DOS system disk.

Step 2 copy “debug” command from DOS or windows directory to the system disk.

Step 3 boot the computer from the system disk

Step 4 at command prompt type debug and enter you will see a “-“ blinking.

Step 5 type o 70 2E and enter

Step 6 type o 71 FF and enter

Step 7 type q and enter

Step 8 remove the system disk and reboot the computer, unplug power cable and re plug it, power ON your computer and settings reset.

The character “ o “ in the above commands is English alphabet “o” and not the number 0, it outputs the value to IO ports, The number 70 and 71 are port numbers which are used to access CMOS memory. FF – tells CMOS that there is an invalid checksum and it resets the CMOS settings as well as BIOS password.

Reset BIOS password using Software

CmosPWD application that can be used to retrieve and decrypt the BIOS password. It also provides backup, restoral, and erasing capabilities.

Works with the following BIOS * 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

Step 1 Download http://www.cgsecurity.org/cmospwd-5.0.zip & extract to a folder. Extract to a folder “ cmos “.

Step 2 To work on CMOS memory, ioperm need to be installed and running. ioperm gives direct port I/O access for specified ports to user-mode process (ring 3) using Ke386SetIoAccessMap and Ke386IoSetAccessProcess kernel functions.

Step 3 Log on to Windows as Administrator.

Step 4 Run command prompt

Step 5 go to the directory d:\cmos\windows by using command “ cd\” then go to “d:” where the cmos directory is present. Then type cd cmos then press enter key then type cd windows and press enter key

Step 6 when you are in d:\cmos\windows then type “ioperm.exe –i” hit enter.

Step 7 to start ioperm service type “net start ioperm” hit enter.

Step 8 type “Cmospwd_win.exe /k” hit enter , the below commands will appear in the prompt 1 – Kill cmos 2 – Kill cmos (try to keep date and time) 0 – Abort Choice :

Step 9 Type 1 and hit Enter to clear cmos.

cmospwd1

now the password is reset and you will have to insert a new password and save it.

Reset BIOS password using Backdoor BIOS Password

Many BIOS manufacturers have provided backdoor passwords that can be used to access the BIOS setup in the event you have lost your password. These passwords are case sensitive, so you may wish to try a variety of combinations. WARNING: Some BIOS configurations will lock you out of the system completely if you type in an incorrect password more than 3 times. Read your manufacturers documentation for the BIOS setting before you begin typing in passwords.

Award BIOS backdoor passwords:

ALFAROME BIOSTAR KDD ZAAADA
ALLy CONCAT Lkwpeter ZBAAACA
aLLy CONDO LKWPETER ZJAAADC
aLLY Condo PINT 01322222
ALLY d8on pint 589589
aPAf djonet SER 589721
_award HLT SKY_FOX 595595
AWARD_SW J64 SYXZ 598598
AWARD?SW J256 syxz
AWARD SW J262 shift + syxz
AWARD PW j332 TTPTHA
AWKWARD j322
awkward

AMI BIOS Backdoor Passwords:

AMI BIOS PASSWORD HEWITT RAND
AMI?SW AMI_SW LKWPETER CONDO

Phoenix BIOS Backdoor Passwords:

phoenix PHOENIX CMOS BIOS

Misc. Common Passwords

ALFAROME BIOSTAR biostar biosstar
CMOS cmos LKWPETER lkwpeter
setup SETUP Syxz Wodj

Other BIOS Passwords by Manufacturer

Manufacturer 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
TMC BIGO
Toshiba Toshiba

Toshiba BIOS

Most Toshiba laptops and some desktop systems will bypass the BIOS password if the left shift key is held down during boot

IBM Aptiva BIOS

Press both mouse buttons repeatedly during the boot