Panasonic Toughbook CF-H2


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7 years 3 months ago #5799 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
just getting back to this, the unlocked bios is crippled there is no support for some of the hardware even tho the device works under the locked bios

I have compared the unlocked bios with the same bios with a supervisor password and even a 3 way compare with the oem bios dump

Next step is to work out where the various information is located on the chip, that should narrow down the password location as long as the bytes are not spread out

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7 years 3 months ago #5800 by reverendalc
was your clean bios from a different model?

i found some scripts for IDApro which are better suited for reverse engineering EFI, but still the problem remains that all names are lost

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7 years 3 months ago #5810 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
Its the same base model (CF-H2A Mk 1) I'm not sure how many variations there are but I don't see there being multiple bioses

Here's the unlocked dump and the same dump with the supervisor password set for comparison, according to ExamDiff there are 138 changes between files but comparing them to the oe dump is proving difficult.

All files are AMI aptio v4

www.sendspace.com/file/ejk0j7

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7 years 3 months ago #5811 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
Just poking around in these 2 files in ExamDiff Pro again and found it, FF filled 20 bytes @ 5B73A8 what is a nvar setting and it dropped the supervisor password now all I have to do is compare the OE dump fingers crossed :cheer: :cheer:

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7 years 3 months ago #5812 by reverendalc
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7 years 3 months ago - 7 years 3 months ago #5817 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
Well to draw this to a close, I have now got the OE bios fully working, It took a while and was a bit of a mare but I found a pattern in the hex near to the 'No asset tag' ansi text
02 01 0C 00 D0 41 03 0A 00

The 4 bios files I have been working with the original has a different layout so it does take some time to dig through

Hope this comes in useful to someone with a Toughbook a AMI Aptio bios/efi (2009 onwards)

thanks for the input B)

ps. All hardware is detected and the wwan card is fully functional :cheer:
Last edit: 7 years 3 months ago by Flash22.
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7 years 3 months ago #5818 by reverendalc
Excellent. Thanks for chronicling your progress in here.

Hopefully it'll help somebody someday

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7 years 1 week ago #6661 by zanzee
Replied by zanzee on topic Panasonic Toughbook CF-H2
Sorry to bring back an old thread but I'm in the same situation as you were. I bought 4 cf-31 laptops off a government auction, one came looked. I have a SPI programer but it fails to read the eeprom while on the board. I tried turning it on without ram but still just fails to read. I'll have to unsolder it to get much further.

Now if I read what you did right you just FF the following hex?

"02 01 0C 00 D0 41 03 0A 00"

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7 years 6 days ago #6700 by zanzee
Replied by zanzee on topic Panasonic Toughbook CF-H2
"02 01 0C 00 D0 41 03 0A 00" I assume just means "enabled" as I found it repeated through out the bios right after a setting string. I never once found it near "No Asset tag" though.

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7 years 5 days ago #6703 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
The information in this thread is for the H2 Toughbook, there are plenty of unlocked bios for the 31 and they are simpler to hack - only just seen the notification in my spam folder tbh

The No asset Tag is in the ascii code not the hex
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7 years 5 days ago - 7 years 5 days ago #6706 by zanzee
Replied by zanzee on topic Panasonic Toughbook CF-H2
Yeah I was trying to use the "No asset tag" as a locating marker as you suggested. I thought the two machines would be similar as they're from around the same generation and use the same AMI uefi bios types. I've never found any good info on hacking the CF-31 bios only people mentioning it. If you could point me in the right direction that would be amazing.

Thanks.
Last edit: 7 years 5 days ago by zanzee.

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7 years 4 days ago #6708 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
Can post the hex dump and I will have a look at it

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7 years 3 days ago #6720 by zanzee
Replied by zanzee on topic Panasonic Toughbook CF-H2
Here's the dump from my mk1 CF-31

Thanks again.
Attachments:

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7 years 1 day ago - 7 years 1 day ago #6732 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
Sorted I will have a look at it shortly
Last edit: 7 years 1 day ago by Flash22.

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7 years 1 day ago #6736 by zanzee
Replied by zanzee on topic Panasonic Toughbook CF-H2
its a "MXIC MX 25L6445E"

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7 years 16 hours ago - 7 years 16 hours ago #6740 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
I have had to change some of my software so learning how the new one runs - I have a compare running the moment but its taking an age to sequence, Your bios is different to the one on the H2 the binary addresses and layout are very strange to me
Last edit: 7 years 16 hours ago by Flash22.

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6 years 11 months ago - 6 years 11 months ago #6763 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
have you managed to do anything with these cf-31's I have another bios dump but its for the mk2, still on the look out for the Mk1 bios

edit. give this a go......................................
Attachments:
Last edit: 6 years 11 months ago by Flash22. Reason: added a file 4 hours later

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6 years 11 months ago - 6 years 11 months ago #6769 by zanzee
Replied by zanzee on topic Panasonic Toughbook CF-H2
I'll try giving it a shot tomorrow, thanks again.
Last edit: 6 years 11 months ago by zanzee.

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6 years 11 months ago - 6 years 11 months ago #6774 by phuongnt
Replied by phuongnt on topic Panasonic Toughbook CF-H2
I tried to follow your instruction on my CF-H2PAEBX1M but it seems that the structure is different from yours. Could you please help?

Thanks
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Last edit: 6 years 11 months ago by phuongnt.

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6 years 11 months ago - 6 years 11 months ago #6775 by Flash22
Replied by Flash22 on topic Panasonic Toughbook CF-H2
Yours is a CF-H2P making it a newer mk3 model, it seems around 2009-2010 certain parts of the bios became dynamically written - this makes finding the passwords even more complex

I have discovered another method that I have applied to zanzee's bios above for a CF-31, I have no way of testing it other than waiting on zanzee's reply

Edit. just noticed the later models have a 16mb bios rather than the mk1/2 bios what is 8mb
Last edit: 6 years 11 months ago by Flash22.
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