Re: HP Elitebook 840 G2: Flash BIOS to clean password
So it looks like it might be HP Sure Start in action. On booting, the laptop indicates a checksum error and then restarts with the old bios as configured. Any further thoughts on this?
Benoire
New Member
Last Activity: 12-18-2024, 07:17 PM
Joined: 02-15-2018
Location: Auckland
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Re: HP Elitebook 840 G2: Flash BIOS to clean password
Thanks. Tried this but it was unsuccesful, the flashchip won't erase. It is stating that block protection is active but I'm not sure how to get rid of that on the device. I know that HP Chromebooks use a write protect screw, but I'm not aware of the 840 having something similar.Leave a comment:
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Re: HP Elitebook 840 G2: Flash BIOS to clean password
ok, so got it reading the other chip which wasn't being recognised... Was a commandline setting in flashrom which is required for the pi.
Ran the read command 3 times and md5 hash was the same so this should be a complete dump of the bios image.
The image size was 16mb which appears to be the right size as what you suggested....Leave a comment:
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Re: HP Elitebook 840 G2: Flash BIOS to clean password
Erm it was a soic clip and then a raspberry pi with SPI enabled to access the chip. There are two chips on the back below the cover which are exposed. I could try and get a reading of the other one and see if that has something?Leave a comment:
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Re: HP Elitebook 840 G2: Flash BIOS to clean password
Sorry, I'm new to chips in this manner... I'm not sure what you are trying to say. What I was stating was that I had read the BIOS chip 3 times and saved as 3 different file names to ensure that the connection was not corrupting the read; i.e. that reading the chip was stable enough to access it properly... The 3 files had the same hash which suggests that the reading was stable enough.Leave a comment:
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Re: HP Elitebook 840 G2: Flash BIOS to clean password
Cool thanks. Posted below. I've MD5 checked summed 3 pulls from the chip and they all matched the hash so I'd say it read correctly....Leave a comment:
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HP Elitebook 840 G2: Flash BIOS to clean password
Hi
I picked up a heavily damaged laptop from a friend who had basically screwed it over. I've fixed most of the bits but now I need a way to remove the BIOS password that he forgot the password to. I knew this before I got it but thought I could get around it.
I can read and write the chip on the motherboard using a SOIC clip and my pi and reading certainly seems consistent.
I've dumped the current BIOS as a precaution but all I want to do is effectively replace the current with a BIOS...Leave a comment:
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Re: New Members - please post your introductions here
Hello
I'm just a curious breaker of technology looking for a way to save some money by fixing my mistakes, rather than binning them! Predominately responsible for breaking motherboard bios' by flashing the wrong type!Leave a comment:
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