X1 Yoga 2nd Generation with a BIOS password

[deggial]

Hello,

I have a X1 Yoga 2nd Generation with a BIOS password. I read the BIOS chip and patched it with the autopatcher. After I flashed the chip, the laptop is not booting anymore. Even I flash the original BIOS back, it is still not booting.

What can be the reason? I attached the original and patched files. I'll be very thankful if anyone can help.

Best regards

[volinakis]

Re: X1 Yoga 2nd Generation with a BIOS password

Hello,

I have a X1 Yoga 2nd Generation with a BIOS password. I read the BIOS chip and patched it with the autopatcher. After I flashed the chip, the laptop is not booting anymore. Even I flash the original BIOS back, it is still not booting.

What can be the reason? I attached the original and patched files. I'll be very thankful if anyone can help.

Best regards

your bios dump wasn't made properly, almost sure because of programmer you used. Ask for SMDFlea, Vesko, hardware1 or peste to help you reconstruct your file, they are masters in this stuff.

that's why i recommend to use another bios chipset for patched file.

[deggial]

Re: X1 Yoga 2nd Generation with a BIOS password

Hello volinakis,

thank you for your response. I'm using a Raspberry Pi and flashrom as programmer. I'll try to reach the masters you mentioned and hope that they can help me.

[hardware1]

Re: X1 Yoga 2nd Generation with a BIOS password

Hello volinakis,

thank you for your response. I'm using a Raspberry Pi and flashrom as programmer. I'll try to reach the masters you mentioned and hope that they can help me.

As @volinakis said your dump file isn't good, I assume that you are using a clip to read the BIOS chip and this isn't the proper way.

If this is your Serial Number "R90PK3FZ" and your CPU is "i7-7600U", you can try that file and see if the device will works or not.
https://www.badcaps.net/forum/showpo...86&postcount=3

I don't know about flashrom, but you need to verify the chip after flashing the BIOS, or you can read the chip again and compare between the 2 files to see if they are identical or not.

[deggial]

Re: X1 Yoga 2nd Generation with a BIOS password

Hello hardware1,

thank you for directing me to that post. It is luckily the same serial number and CPU! I downloaded that BIOS but now I'm having problems flashing it.

I found out that the chip on that notebook was not fully supported by flashrom software. I wonder how it worked at the first place. I think I need a different programmer, or I need to replace the chip. I'll write here, if I make any progress.

[Markus1741]

Re: X1 Yoga 2nd Generation with a BIOS password

Hello hardware1,

thank you for directing me to that post. It is luckily the same serial number and CPU! I downloaded that BIOS but now I'm having problems flashing it.

I found out that the chip on that notebook was not fully supported by flashrom software. I wonder how it worked at the first place. I think I need a different programmer, or I need to replace the chip. I'll write here, if I make any progress.

I apologize if I interfere here but if this is the only backup of your chip you have a huge problem your dump does not contain any Me region and also further parts are missing.

It won't work with your dump.

For flashrom I've been using it for a long time, I can only assume that some things didn't work when I read them out.

With flashrom and linux it usually works quite well.

However, I've now bought an Xgpro T48 programmer, which is a lot better than the Ch431A programmer.

I assume you used that.

Of course it's a question of how often you need it.

I once looked for the exact same model here in the forum and did a ME Clean + Patch.

Maybe this will help you, your original dump won't work like that.

[deggial]

Re: X1 Yoga 2nd Generation with a BIOS password

Hello Markus1741,

thank you for your response and providing an additional dump. I am using Raspberry Pi and flashrom, I attached a picture of my setup. I'm connecting to the Raspberry Pi via SSH and run the flashrom command on the Pi itself. I also have a CH431A (black) but I used it only once, it was slow compared to the Pi and I read that it has some flaws about voltage (3V/5V).

At the moment I cannot read or write to the chip anymore, I think I need to replace it now. The chip model is MX25L12873F, and "flashrom --list-supported" command didn't list that model in my version. I see that the new version of flashrom v1.3 has added the support, but I assume my flashrom is older, I may need to update it. That would explain why the original dump was incomplete.

I think at this point, I have no other choice than to unsolder the chip and replace it with a new one, since it seems completely gone now.

[deggial]

Re: X1 Yoga 2nd Generation with a BIOS password

Hello all,

I ordered a new MX25L12873F chip, and flashed the BIOS with the dump Markus1741 provided. Unfortunately still the same problem. The light on the power button blinks three times after I plug the power supply in, and that's all. Nothing happens if I press the power button.

As a last resort, I'm thinking to buy the following mainboard:
https://www.ebay.de/itm/155081966326

Is there any hope to fix that, can I try anything else? Is it possible to use my original dump (which has missing parts) and the other dumps provided in this forum to create a working dump? Or should I order that mainboard for 199 €?

Thanks and kind regards

[lionking007]

Please help me remove my password
type 20JG-S01000 S/N R9-0NZURB 17/09

[SMDFlea]

post moved to password thread.

[Maxpower3]

try

[ HOW TO USE THE PATCH ]
STEP 1: Flash and replace current BIOS with the generated patch file
STEP 2: Boot the machine
STEP 3: Press ENTER/F1/etc. to enter BIOS settings
STEP 4: Enter any character when asked for Supervisor Password
STEP 5: Press enter when it shows Hardware ID
STEP 6: Press space bar 2x when asked
STEP 7: Turn off machine
STEP 8: Restore original BIOS
STEP 9: Reset BIOS settings to factory default

[ NOTES ]
When booting the patched BIOS you might have to:
- Hold the anti-tamper switch down the whole time (use tape)
- Remove the hard disk or replace it with a locked one