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Lost BIOS password - Resetting the BIOS

July 2015


Lost BIOS password - Resetting the BIOS




You don't remember your BIOS password! How to reset it?

The BIOS password is stored in a non-volatile memory, which can be cleared, hence clearing the password too! The chip is located on the motherboard. Two method are described here - hardware reset and software reset. Both these methods have been described in detail.

Hardware reset


The aim is to reset the BIOS so that data that the related passwords is cleared out. This is done by moving a jumper on the motherboard. The biggest challenge is to find this jumper.
Note that: This procedure also reset the BIOS settings to default!
  • Step 1: Turn off your PC, unplug the power cable and open your system unit. Touch the chassis of the casing with a metallic object to discharge static electricity.
  • Step 2: Check the documentation for your motherboard to locate the position of the jumper that resets the BIOS. If you don't have a manual, look on your motherboard for one of the following tags: CLR BIOS, CLEAR BIOS, CLR CMOS, CLEAR CMOS, RESET BIOS or RESET CMOS. If the jumper is on 2-connector pins and it is held on a single pin, place it on both, wait one second then return it to its original position.
  • Step 3: Find the jumper on your motherboard reset it. It is usually close to the battery.If the jumper is on 3-connector pins, place it on the middle and the initially uncovered pins. Wait for some time and put the jumper in its original position (PIN1-PIN2).If the jumper is on a 2-connector pins and that is holding on a single pin, place it on both, wait one second and then return it to its original position.
  • Step 4: Power up and start your PC: the password will have disappeared.

Software reset


If the password is only required at setup, it is possible, with specific motherboards, to recover it without having to follow the hardware reset instructions described above.
Download CMOSPWD software (freeware): here
The program 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
For unlimited offline reading, you can download this article for free in PDF format:
Lost-bios-password-resetting-the-bios.pdf

See also

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Original article published by PurpleStorm. Translated by netty5. - Latest update by jak58
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