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Clear Cmos Of A Dell Inspiron 8500

#1 User is offline   XeLoRy 

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Posted 11 July 2004 - 08:27 AM

Hello, i bought a Dell inspiron 8500 laptop but there is a password at the bios...

I ve disconnected the cmos battery during 3 day but with no success, the pass is still there...
Then i learned on google that there was 2 category of password for the bios :

Another type of chip (the kind we are interested in) is manufactured with a blank information area that can be programmed or filled with information. These chips are commonly used to store settings and passwords; and come in 2 basic sorts: VOLATILE and NON-VOLATILE. 

VOLATILE chips use a source of electricity to help them keep their information, such as a battery. They are less expensive and are used to store computer settings, and also passwords on most computers. If one of these chips has a password on it, the battery can be removed and after a time (between 2 seconds to 30 minutes, depending on the chip) the password will be erased. 

NON-VOLATILE chips do not need electricity to keep their information, but are more expensive. If there is a password on one of these chips, it can be removed from power for years and still have the password on it. (However this does not mean that it is permanent.) Remember that the information on Non-Volatile chips can be filled with information. This information can also be changed or erased.



and so my Dell have a non-volatile chip, so i have to flash the cmos chip to clear the pass, but i have to do this with an eeprom programmer or with a paperclip....

The paperclip will be used to jump (or make a temporary electrical connection) between these 2 pins of the chip.

I ve tested with the paperclip method with all the possible combinaisons between the pins with no success, the manufacturer mode is not enclenched as it must be...

note : the tutorial found on google was about a dell inspiron 8100/8200 chip which is 24c02 and the chip i ve found on my dell motherboard is called 24c04 and i m sure it s the cmos chip but the metho of paperclip is perhaps only for the 24c02 one... so i ask you if you know a method for the 24c04 chip..

So i have to reprogram the chip with a eeprom tool but i dont know how it works and how i can do that, so my topic is open to your suggestions or your help in eeprom maneer...


ps: big thx and sorry for bad english ;)
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#2 User is offline   TheOther 

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Posted 11 July 2004 - 10:58 AM

Well I cant help you with that, but I know this is the wrong section to ask this.
Try Windows systems or linx/unix.

good luck!
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#3 User is offline   linuxwolf 

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Posted 11 July 2004 - 02:05 PM

yeah, moderators shift this topic. :D
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#4 User is offline   XeLoRy 

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Posted 11 July 2004 - 03:10 PM

it s an xploit to unlock a Dell ! isnt it ? :)

ok move my topic plz and try to help me plz :)
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#5 Guest_T3cHn0b0y_*

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Posted 13 July 2004 - 09:15 AM

Although non-volitile, the chip will still need a power supply to alter information stored on it. You'll need to find out which 2 pins are used on the chip for the supply voltage and connect them to a battery or something, but make sure you know the voltage level first (CMOS typically ranges between 0 and 12 Volts).
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