OK so that is it. This is why people focus around the MEC1503: because the BIOS password is saved there.
But, from what you are saying, just replacing the MEC1503 with a blank one should work to unlock the unit?...
speed488
Member
Last Activity: 12-30-2024, 10:17 AM
Joined: 02-19-2024
Location: Montreal Quebec
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The MEC has an EEPROM though.
According to this: [url]https://docs.nordicsemi.com/bundle/ncs-2.3.0/page/zephyr/boards/arm/mec15xxevb_assy6853/doc/index.html[/url]
[I]MEC152x is identical to MEC150x except for an enhanced Boot-ROM SPI loader.[/I]
So we can take a look at the MEC152X datasheet: [url]https://ww1.microchip.com/downloads/en/DeviceDoc/MEC152x-Data-Sheet-DS00003427A.pdf[/url]
[I]2K byte Internal EEPROM (MEC1523 Only)[/I] - Which should be present in the MEC1503 as well
So is the password stored there?
If it's the case, I...Leave a comment:
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Do anyone have a MEC1503 dump (with some info on the laptop it comes from: S/N, password lock, bios version, etc...) or, at least, info on how I can dump mine? I'd like to dig in the binary trying to understand what's inside.Leave a comment:
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Hi all, sorry I put the project on the shelf for the summer time and I redid part of my home lab so I wasn't able to do much for a few months.
So I caught up with trying the "CPU reset nRESET_IN of the MEC to the Segger's RESET pin" and it's a "no go". The entire motherboard resets and shuts down.
I've read the other posts and I cannot register to [url]https://mslw.com[/url]. They say: "Sorry, your email or IP matches that of a known spammer. If you feel this is a mistake, please contact an administrator." 😂
So I wasn't able to get more...Leave a comment:
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I think you were addressing the question to me. No success with the Segger programmer. I rechecked all the connections and everything looks good.
Here is the output of the Segger software. I selected MEC1503 JTAG and all other configuration to auto.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3278568}[/ATTACH]
From reading the logs, I'm wondering if I should also wire up the CPU reset nRESET_IN of the MEC to the Segger's RESET pin? From the...Leave a comment:
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Yes, that was done as well. Hard to tell from the picture, but it is moved.
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"413","title":"Screenshot_20240305_125629.png","width":"544","data-attachmentid":3229220}[/ATTACH]...Leave a comment:
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Here are the documents I have found online - I can't remember if it was on a site or a telegram channel.Leave a comment:
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I did a bit more research and found this (see bottom link for source)
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"296","title":"fetch?id=2259258.jpg","width":"458","data-attachmentid":3229034}[/ATTACH]
Looks like the T15 / T14 / P14 all have similar MEC1503 chips.
I also found the schematics and board layout PDFs while searching to correlate the image found on the other thread
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"484","title":"Screenshot_20240305_081553.png","width":"671","data-attachmentid":3229035}[/ATTACH]...Leave a comment:
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Hi. I googled my motherboard model of my Lenovo P14s Gen2 : [B]HT4B0/HP4B0/HT5B1/HP5B1/HT4B2 NM-D353 Rev: 1.0[/B] and I stumbled on this page.
From what I can see, resetting the supervisor password is not possible at the moment.
However, I was wondering if it is not possible [B]while keeping components on the motherboard[/B]. Meaning that if I had the possibility to remove the MEC (or other) component, this might help to find a solution to this problem.
Is there more technical data on what theoretically should be done to remove/reset the supervisor password on these...Leave a comment:
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Hi everybody,
I'm an electrical engineer from Montreal, Qc Canada. I've stumble on this site because I acquired a laptop with a faulty BIOS chip and I'm giving it a shot to repair it.
The community here looks pretty awesome and I hope I'll have the chance to chip in!
ThanksLeave a comment:
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