How to crack any BIOS PASSWORD

READ EVEYTHING BEFORE YOU USE ANY METHOD LISTED BELOW

Basic BIOS password crack – works 9.9 times out of ten
This is a password hack but it clears the BIOS such that the next time you start the PC, the CMOS does not ask for any password. Now if you are able to bring the DOS prompt up, then you will be able to change the BIOS setting to the default. To clear the CMOS do the following:
Get DOS prompt and type:
DEBUG hit enter
-o 70 2e hit enter
-o 71 ff hit enter
-q hit enter
exit hit enter
Restart the computer. It works on most versions of the AWARD BIOS.

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Accessing information on the hard disk
When you turn on the host machine, enter the CMOS setup menu (usually you have to press F2, or DEL, or CTRL+ALT+S during the boot sequence) and go to STANDARD CMOS SETUP, and set the channel to which you have put the hard disk as TYPE=Auto, MODE=AUTO, then SAVE & EXIT SETUP. Now you have access to the hard disk.

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Standard BIOS backdoor passwords
The first, less invasive, attempt to bypass a BIOS password is to try on of these standard manufacturer’s backdoor passwords:
AWARD BIOS
AWARD SW, AWARD_SW, Award SW, AWARD PW, _award, awkward, J64, j256, j262, j332, j322, 01322222, 589589, 589721, 595595, 598598, HLT, SER, SKY_FOX, aLLy, aLLY, Condo, CONCAT, TTPTHA, aPAf, HLT, KDD, ZBAAACA, ZAAADA, ZJAAADC, djonet, %øåñòü ïpîáåëîâ%, %äåâÿòü ïpîáåëîâ%
AMI BIOS
AMI, A.M.I., AMI SW, AMI_SW, BIOS, PASSWORD, HEWITT RAND, Oder
Other passwords you may try (for AMI/AWARD or other BIOSes)
LKWPETER, lkwpeter, BIOSTAR, biostar, BIOSSTAR, biosstar, ALFAROME, Syxz, Wodj
Note that the key associated to “_” in the US keyboard corresponds to “?” in some European keyboards (such as Italian and German ones), so — for example — you should type AWARD?SW when using those keyboards. Also remember that passwords are Case Sensitive. The last two passwords in the AWARD BIOS list are in Russian.

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Flashing BIOS via software
If you have access to the computer when it’s turned on, you could try one of those programs that remove the password from the BIOS, by invalidating its memory.
However, it might happen you don’t have one of those programs when you have access to the computer, so you’d better learn how to do manually what they do. You can reset the BIOS to its default values using the MS-DOS tool DEBUG (type DEBUG at the command prompt. You’d better do it in pure MS-DOS mode, not from a MS-DOS shell window in Windows). Once you are in the debug environment enter the following commands:

AMI/AWARD BIOS
O 70 17
O 71 17
Q

PHOENIX BIOS
O 70 FF
O 71 17
Q

GENERIC
Invalidates CMOS RAM.
Should work on all AT motherboards
(XT motherboards don’t have CMOS)
O 70 2E
O 71 FF
Q
Note that the first letter is a “O” not the number “0”. The numbers which follow are two bytes in hex format.

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Flashing BIOS via hardware
If you can’t access the computer when it’s on, and the standard backdoor passwords didn’t work, you’ll have to flash the BIOS via hardware. Please read the important notes at the end of this section before to try any of these methods.

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Using the jumpers
The canonical way to flash the BIOS via hardware is to plug, unplug, or switch a jumper on the motherboard (for “switching a jumper” I mean that you find a jumper that joins the central pin and a side pin of a group of three pins, you should then unplug the jumper and then plug it to the central pin and to the pin on the opposite side, so if the jumper is normally on position 1-2, you have to put it on position 2-3, or vice versa). This jumper is not always located near to the BIOS, but could be anywhere on the motherboard.
To find the correct jumper you should read the motherboard’s manual.
Once you’ve located the correct jumper, switch it (or plug or unplug it, depending from what the manual says) while the computer is turned OFF. Wait a couple of seconds then put the jumper back to its original position. In some motherboards it may happen that the computer will automatically turn itself on, after flashing the BIOS. In this case, turn it off, and put the jumper back to its original position, then turn it on again. Other motherboards require you turn the computer on for a few seconds to flash the BIOS.

If you don’t have the motherboard’s manual, you’ll have to “brute force” it… trying out all the jumpers. In this case, try first the isolated ones (not in a group), the ones near to the BIOS, and the ones you can switch (as I explained before). If all them fail, try all the others. However, you must modify the status of only one jumper per attempt, otherwise you could damage the motherboard (since you don’t know what the jumper you modified is actually meant for). If the password request screen still appear, try another one.
If after flashing the BIOS, the computer won’t boot when you turn it on, turn it off, and wait some seconds before to retry.

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Removing the battery

If you can’t find the jumper to flash the BIOS or if such jumper doesn’t exist, you can remove the battery that keeps the BIOS memory alive. It’s a button-size battery somewhere on the motherboard (on elder computers the battery could be a small, typically blue, cylinder soldered to the motherboard, but usually has a jumper on its side to disconnect it, otherwise you’ll have to unsolder it and then solder it back). Take it away for 15-30 minutes or more, then put it back and the data contained into the BIOS memory should be volatilized. I’d suggest you to remove it for about one hour to be sure, because if you put it back when the data aren’t erased yet you’ll have to wait more time, as you’ve never removed it. If at first it doesn’t work, try to remove the battery overnight.

Important note: in laptop and notebooks you don’t have to remove the computer’s power batteries (which would be useless), but you should open your computer and remove the CMOS battery from the motherboard.

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~ by CVS268 on Sun, 13 Dec, 2009.

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