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110 lines
5.2 KiB
Markdown
110 lines
5.2 KiB
Markdown
---
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title: BIOS Passwords
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language: en
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layout: default
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created: 2008-07-16 00:44:43 +0200
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updated: 2009-10-30 22:53:46 +0100
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toc: true
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tags:
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- know-how
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- hacking
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- hardware
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- bios
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- passwords
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---
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[Diese Seite auf Deutsch.]({% post_url 2009-10-30-bios-passwords-de %})
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Since Notebook-manufacturers know of the problem of forgotten passwords, they often implement easy ways to remove BIOS
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passwords into their notebooks.
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<p><div class="notewarning" markdown="1">
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**WARNING!
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I don't take any responsibility for damages your notebook could get by using these tricks.**
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</div></p>
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Removing the battery
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====================
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Remove AC power and remove the battery. Now find and remove the BIOS battery for about a minute and then reinsert it.
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If this doesn't work, try it with 10 minutes or even 20.
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If you can't easily remove the BIOS battery, you can short it for about 1 to 2 seconds. But never short it for longer
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because it will get hot and could even explode.
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The BIOS battery is mostly located somehwere below the notebook's keyboard. To remove the keyboard, there are sometimes
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only some clips holding the whole thing - but sometimes, you have to disassemble half of the notebook just to get to
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the inside.
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This trick works with almost any notebook - even with the "high secure" [Fujitsu-Siemens Lifebook E-series]({% post_url 2008-07-20-fujitsu-lifebook-e-series %}).
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<img src="{{ site.url }}/assets/baycomwb2_5.jpg" alt="" width="320" />
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Reset-switch
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============
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If you can't get rid of the password by removing the BIOS battery, there often is a Jumper or DIP-switch, which
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disabled the password. A Jumper could be located in the RAM-extension slot. Also take a look at the mainboard below the
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keyboard. Sometimes, the Jumpers are even labeled - if not, just try.
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With DIP-switches - if you found some - you should start trying with the highest switch, because the first ones mostly
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define the processor speed and you could possibly destroy your processor. You should - with the notebook switched off -
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switch the highest switch to the opposite position, switch on the notebook, check whether the BIOS password is still
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requested and an empty password doesn't work (just press ENTER at the prompt). If so, switch off the notebook, switch
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the highest switch to its initial position and try the same with the next switch.
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If you found the correct switch, do the following before switching the switch back to its initial position: Go to
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BIOS-Setup and clear the password there or define a new one. Afterwards, switch off the notebook, switch the DIP-switch
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to its initial position and reassemble the notebook.
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<img src="{{ site.url }}/assets/acer203tx3.jpg" alt="" width="320" />
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DELL notebooks
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==============
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DELL-notebooks store the BIOS-password in an 24C02-EEPROM and therefore, the password can't be deleted by removing the
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BIOS-battery. Also, there's no Jumper or DIP-switch, which resets the password. But you will notice a so-called
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"Service Tag" at the password prompt. With it, the DELL-Hotline is able to generate an unlock-password. If you want to
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save the stress with the Hotline, you can find programs in the Internet which generate an unlock-password from the
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Service-Tag. Sadly, I only found a password-generator for Service-Tags ending with -D35B.
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If your notebook has a different Service-Tag, there's an alternative:
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You can manually erase the EEPROM. But you have to find it first. Somewhere on your mainboard should be an 8-pin IC
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with "24C02" printed on it. Sometimes, it's located near the CD-ROM or Touchpad. If you found it, notice the
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manufacturer and go to his homepage to download the datasheet of that IC. There should be mentioned the correct pin
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for "clear" or "reset". Short-circuit this pin to ground. There could be a test-contact near the IC leading to the
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appropriate pin. Just short it to ground for some seconds. But pay attention not to short the wrong pin to ground -
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this could destroy the notebook. After this procedure, the BIOS password should be deleted.
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[This homepage](http://www.darkmagic.org/mike/dell-tag/dell/dell.html) contains a really good explanation of this
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procedure. Some more infos are on the DELL page.
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<img src="{{ site.url }}/assets/delllati.jpg" alt="The password prompt of DELL notebooks. Here you can see the service tag." width="320" />
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Standard password
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=================
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By the way: Notebooks of the first generation used to have standard passwords to enable access to them. For AWARD-BIOS
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there were e.g. `LKWpeter` and `aLLy` - depending on the BIOS' version. You can find lists of such standard passwords
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on the net. For current BIOS-variants and -versions, there are no known standard passwords.
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Special handling
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================
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<ul>
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{% for page in site.categories.bios-password %}
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<li><a href="{{ page.url }}">{{ page.title }}</a>{% if page.language == 'de' %} (German){% endif %}</li>
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{% endfor %}
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</ul>
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If everything fails
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===================
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If you can still boot and only need the password to the BIOS-setup, Christophe Grenier's
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[CmosPwd](http://www.cgsecurity.org/wiki/CmosPwd) will help you in most cases. It reads out the CMOS-memory and tries
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to decrypt the password stored there. For SONY Vaio notebooks, look [here]({% post_url 2008-07-20-sony-vaio %}).
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