BIOS is a kind of software situated as a chip in the motherboard of your computer. It is necessary to create a Bios password because it is able to stop someone booting up your computer system or making changes in your computer. But you may come cross the similar problem to “I made a password to get into my BIOS. How do I get into my BIOS if I can't remember my password?” There is no need to worry. There are many known ways to reset an unknown Bios password. Here I will share 5 effective methods with you:
Method 1: Reset Lost Bios Password by Removing CMOS Battery
Removing the CMOS battery is the simplest way to remove a BIOS password. A computer will remember its settings and keep the time even when it is turned off and unplugged because these parts are powered by small battery inside the computer called a CMOS battery. If we pull out this battery, the computer will forget a lot of its hardware settings, including its BIOS password. Please follow the instructions below:
Take out the CMOS battery and wait 10 – 25 minutes before putting it back in. The reason for this wait is because the computer can still store power in its capacitors even though everything is unplugged. The waiting period allows enough time for them to discharge. Plug everything back in, power up the computer and enter the BIOS again. If everything went well there should be no more password. In some cases, if you get weird error messages during boot up now, you will need to go to “Load BIOS Defaults” in BIOS and save the changes to fix them.
If this method didn’t work, try one of the methods below.
Note: This should not be performed on Laptops if you are not experienced working with laptop hardware. Make sure to power down the computer, unplug the power cables and unplug any USB devices if they are powered. The computer must not be able to get power from anywhere for this to work.
Method 2: Use Motherboard Jumper to Remove Forgotten Bios Password
Almost all motherboards contain a jumper that can clear all CMOS settings including 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 manufacturers 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 and then again remove the jumper and join the center pin to left pin.
Note: Make sure to turn the PC off before opening the cabinet and resetting the jumper.
Method 3: Performing the Process of Resetting Bios Password with MS DOS Command
The precondition of this method is that you can get into the system when it’s turned on, because this method requires MS DOS.
Open Command Prompt from Programs menu and type in following commands according to the sequence below:
o 70 2E
o 71 FF
After type in the commands above and restart your system. You will reset the CMOS Settings along with the BIOS password successfully.
NOTE: The first character in the above commands is English alphabet "o" and not the number “0”.
Method 4: Take Use of CMOSPwd to Reset Unknown Bios Password
CmosPwd can help us to remove the password directly from the command prompt. It works under Dos, Windows 98, Windows NT, Windows 2000, Windows XP, Windows 2003, Windows Vista, Windows 7, Windows 2008, Linux, FreeBSD, and NetBSD. Detailed steps are as follows:
Step 1: Down CmosPwd and unpack the contents of the file in C disk.
Step 2: Get into Windows Start menu, input cmd in the search box and then press enter.
Step 3: When the Dos prompt appears, type in “c:\cmospwd-5.0\windows\”, and then press enter.
Step 4: Type “ioperm–i” and press enter.
Step 5: Now write the command “cmospwd_win /k” and press enter.
Step 6: Choose the second option by pressing 2, and then enter again.
Note: This program only 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.
Method 5: With Backdoor BIOS Password
It is said that many computer manufacturers create backdoor passwords for their own technicians to use so they can access the BIOS when the hardware is being serviced. Here are some backdoor bios passwords that have been reported:
AMI BIOS Passwords:
AWARD BIOS Passwords:
shift + syxz
PHOENIX BIOS Passwords:
Misc Common Passwords:
Other Manufacturer BIOS Passwords:
Biostar - Biostar
Compaq - Compaq
Dell - Dell
Enox - xo11nE
Epox - central
Freetech - Posterie
IWill - iwill
Jetway - spooml
Packard Bell - bell9
QDI - QDI
Siemens - SKY_FOX
TMC - BIGO
Toshiba - Toshiba
VOBIS & IBM - merlin
Note: All these passwords are case-sensitive and are changed from time to time by manufacturers.