Bypass Latitude CP Bios

Cita:Note: This is for Dell CP and CPI Latitudes, it has not been tried on other models. Another way to crack it is to create a short in the 24c02 chip (the markings on the top of the chip) between pins 3 and 6 when you power on!
Before you try that though, remove the hard-drive and see if you get the same error.
If NOT, then it is a Hard-drive password and not a system password. This fix is for a system BIOS password only. A new Hard-drive should fix it if it boots w/o the hard-drive or is cleared of a system BIOS password.
The chip is below the processor so you have to solder two very small wires and bring them outside the laptop then reinstall the processor. Short the two wires and power on! Pin 1 is the one with the dot in the corner. Next pin on the same side is 2 then 3,4, and 5,6,7,8 going around the corner with pin 8 being across from pin1. The power on password will be disabled and you will be able to access the system settings via the F2 during bootup as if it was never there. This works for me, works great.
Only catch is…if there is also a hard-drive password, it will not disable that one and you will get the same message. But at least you will be able to put in a new hard-drive and use the laptop. I haven’t figured out a fix for the hard-drive one yet, except I may try to adapt a cable to connect the laptop drive to a desktop pc and then I should be able to Fdisk it etc. (the laptop looks for the password protection, I doubt the desktop will especially another brand.) You could try to install the hard-drive in another brand laptop. Perhaps then you can Fdisk it etc. to reclaim it.
For those of you who are not accustomed to soldering PC boards. Make sure the wire does not touch other pins or the case. Do NOT OVERHEAT the chip! Work in short sets of applying heat and let it rest a few minutes between attempts if you can not get it to attach right away. No more than 8 seconds at a time at low temp setting.
I used some old “wire-wrap” wire. It is very-very small, single solid strand, and insulated. Be sure to ground the solder iron to the case just before you solder and REMOVE THE BATTERY FIRST!




Comentarios sobre este procedimiento:

Cita:Hey - this definitely works! I had a couple of CPi chassis sulking in a corner just waiting for the light of day - one a 266 and one a 400. Although the 24C02 were in different locations under the CPU, they both worked a treat. Just to clarify the procedure, as Bruce says you short the pins, press the power button, remove the short, key F2 to go into bios, ESC out of bios and the password is gone. Many thanks Bruce - I can clear the corner now!


Cita:
Finaly it worked the Dell Latitude BIOS Security password word can be cleared by shorting the 24c02 8pin chip I solder 2wires from this chip below the cpu pin 3 and pin 6 and switch it on from the direct power there was no display then I disconnect the short wire you have to disconnect it when it’s on then you see the display and the password is cleared it worked Thank for Brusc Aurand




Cita:the trick is to remove the cmos battery and main power battery then unsolder and lift one leg of the RTC battery, hit the power key a few times and let sit for a few minutes as it will take a minute to drain the board of its current, then reassemble in the reverse order....



Does anybody has right discription to unlock a dell computer?
it ask a password in bios

just find the eeprom in the inner portion of mother board
1.now short the legs of eeprom
2.no. 2,7 and now connect batt to laptop
3.it will sound a beep
4.now remove the short wire from eeprom
5.pack ur laptop now it password free
enjoy


There is no jumper on this particular notebook to reset the CMOS. Even if there were, it would make no difference. The Primary and Administrator passwords are stored in an NVRAM chip (non-volatile ram) that is not dependent on an electrical charge. I disconnected the battery (twice -- and left it disconnected for hours), which is equivalent to resetting with a jumper. It did not clear the passwords, just reset the BIOS back to its defaults. I don't want to go into it in great detail, because it has been covered earlier in the thread. The Dell notebooks (at least this model) are notorious for their difficult-to-bypass passwords.

If you want to short out the NVRAM (or EEPROM), you have to take the laptop apart (you can download a service manual from Dell) and remove the microprocessor board to get to the EEPROM (erasable-programmable) chip. It's an eight-pin chip marked with 24c02 -- though I've heard it can be a 24u05 or something else that starts with a 24. You have to solder fine wires to the third and sixth pins, then put them together (no more than two seconds per try) to short out the chip after you have powered up the computer. Definitely not for the faint-of-heart or unsteady-of-hand -- though the computer is just a doorstop anyway if you can't get it to boot. You can find more detailed info by doing a Google search using terms like Dell/EEPROM/short/password. I took it apart but decided to try the password thing again, and got it to work with the Latitude_MasterPW.exe utility.

Note: This is for Dell CP and CPI Latitudes, it has not been tried on other models. Another way to crack it is to create a short in the 24c02 chip (the markings on the top of the chip) between pins 3 and 6 when you power on!
Before you try that though, remove the hard-drive and see if you get the same error.
If NOT, then it is a Hard-drive password and not a system password. This fix is for a system BIOS password only. A new Hard-drive should fix it if it boots w/o the hard-drive or is cleared of a system BIOS password.
The chip is below the processor so you have to solder two very small wires and bring them outside the laptop then reinstall the processor. Short the two wires and power on! Pin 1 is the one with the dot in the corner. Next pin on the same side is 2 then 3,4, and 5,6,7,8 going around the corner with pin 8 being across from pin1. The power on password will be disabled and you will be able to access the system settings via the F2 during bootup as if it was never there. This works for me, works great.
Only catch is…if there is also a hard-drive password, it will not disable that one and you will get the same message. But at least you will be able to put in a new hard-drive and use the laptop. I haven’t figured out a fix for the hard-drive one yet, except I may try to adapt a cable to connect the laptop drive to a desktop pc and then I should be able to Fdisk it etc. (the laptop looks for the password protection, I doubt the desktop will especially another brand.) You could try to install the hard-drive in another brand laptop. Perhaps then you can Fdisk it etc. to reclaim it.
For those of you who are not accustomed to soldering PC boards. Make sure the wire does not touch other pins or the case. Do NOT OVERHEAT the chip! Work in short sets of applying heat and let it rest a few minutes between attempts if you can not get it to attach right away. No more than 8 seconds at a time at low temp setting.
I used some old “wire-wrap” wire. It is very-very small, single solid strand, and insulated. Be sure to ground the solder iron to the case just before you solder and REMOVE THE BATTERY FIRST!

Hey - this definitely works! I had a couple of CPi chassis sulking in a corner just waiting for the light of day - one a 266 and one a 400. Although the 24C02 were in different locations under the CPU, they both worked a treat. Just to clarify the procedure, as Bruce says you short the pins, press the power button, remove the short, key F2 to go into bios, ESC out of bios and the password is gone. Many thanks Bruce - I can clear the corner now!

Finaly it worked the Dell Latitude BIOS Security password word can be cleared by shorting the 24c02 8pin chip I solder 2wires from this chip below the cpu pin 3 and pin 6 and switch it on from the direct power there was no display then I disconnect the short wire you have to disconnect it when it’s on then you see the display and the password is cleared it worked Thank for Brusc Aurand

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