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How do you unlock password locked BIOS on a used laptop computer without changing the BIOS chip? Answered

Many used laptops are available cheap because they have a password locked BIOS. I know that some folks are charging (US) $20-50 on EBay to do it. How do you do it?


When a laptop BIOS is locked with password, a checksum of that password is stored to a sector of the FlashROM - this is a chip on the mainboard of the device which also contains the BIOS and other settings. For most brands, this checksum is displayed after entering an invalid password for the third time. (Dell uses the service tag #) using this number a password can be calculated. Which is the reason this number is displayed and is the way the OEM tech support calculates a password. Pulling batteries won't do it on laptops nor will booting to dos, (since you can't boot the laptop past the bios password screen) you can't hardly use some software to reset the password!) You can get a password for nearly all laptops at www.bios-unlock.com
no hassles .


8 years ago

<p>A. By Using the Motherboard Jumper:</p> <p>In most motherboards CMOS battery is soldered, which makes it difficult to remove the battery. In this case we use another method.</p> <p>Almost all motherboards contain a jumper that can clear all CMOS settings along with 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 manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.</p> <p>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.</p> <p>Make sure to turn the PC off before opening the cabinet and resetting the jumper.</p> <p> </p> <p>B. By Using Software:</p> <p><br /> I have found that BIOS/CMOS Password Recovery Tool is the most effective.:<br /> BIOS/CMOS Password Recovery Tool is a program that works instantly to remove any lost or forgotten BIOS/CMOS password. Simply boot your PC to DOS and execute the program, and get access to forgotten BIOS/CMOS passwords in just seconds</p> <p>BIOS/CMOS Password Recovery Tool Service: <a href="http://www.biospasswordrecovery.com/">http://www.biospasswordrecovery.com/</a></p>

If kevin hasn't made it clear enough, Google "reset bios (model) laptop". As it's a really common question there's a lot to pick through, but you can find things like this in a few minutes:<br />http://www.geek.com/forums/topic/bios-reset<br />and from places like that, to places like this:<br />http://support.dell.com/support/edocs/systems/ins5100/en/sm/index.htm<br /><br />L<br />

there are 3 pins and a single jumper near the cmos chip. all you have to do is put the jumper on the centre pin and the outside pin that is not presently covered by the jumper. switch the machine on and go into bios, make your changes, switch off and the put the jumper back to the original pins. I've done this literally 199s of times durng my time as a computer techie, it's the same with all m/boards. remove static from you first by touching the psu case while the pc is switched off. you don't want static is fry your cmos!