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Old 07-15-2016, 11:31 PM   #16
AwesomeMachine
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You just take apart the lappy and pull the CMOS battery for a few minutes. It's not reliable security to be able to reset the CMOS password from within the OS. Then people could just reset the password. Many times the jumper on a desktop motherboard is silk screened "CLEAR RUN" or something similar, but it should actually read "RESET", because it resets the BIOS to the default values. Lappy main boards lack a jumper.

Because they are difficult to replace, some lappys have dead CMOS batteries, so you just have to remove all power from the PC itself, for a half hour or so, and the BIOS will reset, and the password will clear.
 
Old 07-20-2016, 10:00 AM   #17
pingu_penguin
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He probably refers to the old cmd tricks , where you use debug in MS Win98
and type : o 70 71

etc to clear bios password. I dont think that trick even works now.
 
Old 07-20-2016, 11:53 AM   #18
dave@burn-it.co.uk
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All that did was invalidate the checksum of the BIOS so it forced a reload of default values.

I rather suspect that modern BIOS code is more protected what with the spread of malware!!
 
Old 07-20-2016, 12:05 PM   #19
beachboy2
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I have never used CmosPwd but it may be worth a try:

http://www.cgsecurity.org/wiki/CmosPwd

It is from the same stable (Christophe Grenier) as TestDisk and PhotoRec:

http://www.cgsecurity.org/
 
Old 07-20-2016, 12:13 PM   #20
ardvark71
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Quote:
Originally Posted by HMW View Post
The mystery deepens... I have yet to stumble over a BIOS with a password that I haven't set myself!
I have and I had to remove the CMOS battery, in part, to clear it....if I'm understanding you correctly.

Regards...
 
Old 07-23-2016, 02:50 AM   #21
hack3rcon
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Quote:
Originally Posted by Emerson View Post
And some hacking may be needed, last time I used flashrom it erased the MAC address of onboard NIC and I had helluva time putting it back.
So?
 
Old 07-23-2016, 02:51 AM   #22
hack3rcon
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Quote:
Originally Posted by beachboy2 View Post
I have never used CmosPwd but it may be worth a try:

http://www.cgsecurity.org/wiki/CmosPwd

It is from the same stable (Christophe Grenier) as TestDisk and PhotoRec:

http://www.cgsecurity.org/
Not useful for me
 
Old 07-23-2016, 08:20 AM   #23
Emerson
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Quote:
Originally Posted by hack3rcon View Post
So?
So what? I had to modify the new file I was loading to include the MAC address. But first I had to find it in original file because I obviously needed to know the address where it is read from. A job with hex editor.
 
Old 07-25-2016, 06:03 AM   #24
JJJCR
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Cool

Quote:
Originally Posted by hack3rcon View Post
I mean is BIOS password.
Desktop or laptop?

For desktop, simply take out the CMOS batt and turn on the PC without the CMOS batt. Turn it off and put back the batt, it should clear the password.

I haven't done this on newer PCs. It used to work on the Pentium days. Good luck!!
 
Old 07-25-2016, 06:43 AM   #25
dave@burn-it.co.uk
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Newer machines use a small amount of none volatile memory for settings.
 
Old 07-25-2016, 08:46 AM   #26
JJJCR
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Exclamation

Quote:
Originally Posted by dave@burn-it.co.uk View Post
Newer machines use a small amount of none volatile memory for settings.
Technology always change.
 
  


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