How to Reset BIOS Password Using CMD

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Here I am going to share a nice trick for how to reset BIOS password using CMD. So before proceeding to the method first you have a little knowledge about BIOS?

What is BIOS?

BIOS is a Basic Input/Output System, is the first code run by a PC when Bootup. The primary function of the BIOS is to set up the hardware and load and start an operating system.

When the PC starts up, the first job for the BIOS is to initialize and identify system devices such as the video display card, keyboard and mouse, hard disk drive, optical disc drive and other hardware. The BIOS then locates software held on a peripheral device (designated as a ‘boot device’), such as a hard disk or a CD/DVD, and loads and executes that software, giving it control of the PC.

Reset BIOS Password Using Command Prompt:-

In this method we used the micro controller programming, Don’t worry if you don’t know anything about microcontroller programming, Just follow exactly below steps:-

Open Command Prompt (press windows key + R and then type cmd and hit enter) and type debug and then debug prompt will be opened and then type following

  1. A Press Enter
  2. MOV AX,0 Press Enter
  3. MOV AX,CX Press Enter
  4. OUT 70,AL Press Enter
  5. MOV AX,0 Press Enter
  6. OUT 71,AL Press Enter
  7. INC CX Press Enter
  8. CMP CX,100 Press Enter
  9. JB 103 Press Enter
  10. INT 20 Press Enter
  11. Press Enter
  12. G Press Enter
  13. Q Press Enter

You done it.

Permanently Clear BIOS Password:-

In this Trick CMOS Don’t ask for BIOS Password. It will clear the BIOS Password. You make batch file and send to your friends.

Open CMD and follow..

  1. DEBUG press enter
  2. -o 70 2e press enter
  3. -o 71 ff press enter
  4. -q press enter
  5. exit press enter

Restart Computer.

About the Author

I'm Shubham Yadav, B.Tech(I.T) Graduate from Behror, Rajasthan. You can follow me on Twitter. You also subscribe to Hack Illusion Feed via RSS or Email.


  1. it is not Woking on my acer aspire 4810 laptop .

  2. On my Gateway 7811 fx laptop it didn’t work also.

  3. please release another idea .

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