Lenovo Thinkpad T495 AMD bios password locked

[gsoft]

let me understand: you used a patched bios from another laptop and now if you write back original bios laptop has black screen? Post original bios backup and serial number, as in rules and explain what you did.

Thank you for answer.
I try to explain what I do.
I use patched bios posted in #22 and now the laptop non boot.

[volinakis]

Thank you for answer.
I try to explain what I do.
I use patched bios posted in #22 and now the laptop non boot.

did you write back original bios and laptop doesn't work? Using clips is the best way to brick a laptop.

[gsoft]

Yes I use clips. I try to write back the original bios and not work but I have a doubt about the quality of the backup I made...
another dubt is about the ch341a, the chip is a 1.8V and I not use the 1.8V adapter...

[volinakis]

Yes I use clips. I try to write back the original bios and not work but I have a doubt about the quality of the backup I made...
another dubt is about the ch341a, the chip is a 1.8V and I not use the 1.8V adapter...

congratulation, you have a branded lenovo door stopper. Before bricking another laptop read BIOS GUIDES of this forum
https://www.badcaps.net/forum/troubl...t=phoenix+bios

[gsoft]

Ok so do you think I fired the chip? But if connect it to the ch431a the software can read and detect it...

[volinakis]

Ok so do you think I fired the chip? But if connect it to the ch431a the software can read and detect it...

since you write back original file and it doesn't work means your backup is fcked up. Use right tools (described in bios tools) if you want to have good results and also check components around bios chipset, clamps may damage them.

[gsoft]

Sorry but I need some explanation because I not find it on forum, please can you help me to understand?

- I read about an autopatcher bat it cannot be used for my laptop because is AMD not Intel
- I ask here and tha answer was to patch with file posted in #22
- I read about using ch341a but nowhere i find info about the 1.8V adapter

So in my situation what I have to do?
I ordered a 1.8V adapter when it arrives can I try to use it to patch again or there is nothing I can do now because I fried the chip?
I think, due I make the backup without the 1.8V adapter, my copy of original firmware is not good. There is a way to get an original bios bin or it is different for every laptop?

Thanks again for you patience

[volinakis]

Sorry but I need some explanation because I not find it on forum, please can you help me to understand?

- I read about an autopatcher bat it cannot be used for my laptop because is AMD not Intel
- I ask here and tha answer was to patch with file posted in #22
- I read about using ch341a but nowhere i find info about the 1.8V adapter

So in my situation what I have to do?
I ordered a 1.8V adapter when it arrives can I try to use it to patch again or there is nothing I can do now because I fried the chip?
I think, due I make the backup without the 1.8V adapter, my copy of original firmware is not good. There is a way to get an original bios bin or it is different for every laptop?

Thanks again for you patience

1st step is to acquire a good bios backup. Since your chipset is 1.8V YOU HAVE TO USE 1.8V adapter. Best way to have a good bios backup is to remove bios chipset from board. Having CH341A use AsProgrammer to backup bios and read 3-4 times until you have 2 identical backups bin files. ALL STEPS ARE DESCRIBED IN BIOS GUIDES but you fail to understand that YOU HAVE TO READ IT!

[gsoft]

Ok thanks but now because I have tried many times to write the chip with patched .bin I can't make a good backup of original firmware So what can I do? Where can I find an original bios bin file?

[Markus1741]

Hello try this new hash patched file from your original file from #18

https://www.badcaps.net/forum/troubl...61#post3261861

[gsoft]

Hello try this new hash patched file from your original file from #18

https://www.badcaps.net/forum/troubl...61#post3261861

Tankyou Markus1741 but is better I wait the 1.8V adapter arrives and try with it or I can also try without it? Do you think patched file is a good dump also if I do it without the adapter?

[Markus1741]

Well I can't tell you that because I don't know exactly what kind of chip you have.
I have a Winbond 25Q128FVSQ, a datasheet from Winbon shows it as 25Q128FV with 2.7V - 3.6V.
I can't even say whether it is only 1.8V.
You yourself have never published which chip you have.

[gsoft]

You are right I have this chip on t495: Winbond 25Q128FWSQ
in datasheet I read 1.8V but until now I make read and write without the 1.8V adapter

[Markus1741]

Hello my patch is based on this guide.

https://www.badcaps.net/forum/troubl...55#post3233555

[gsoft]

Hello my patch is based on this guide.

https://www.badcaps.net/forum/troubl...55#post3233555

Ok but your chip is 3.6V mine is 1.8V so I must use the adapter?

[volinakis]

Hello try this new hash patched file from your original file from #18

https://www.badcaps.net/forum/troubl...61#post3261861

it will not work because Volume_NVRAM_EfiSystemNvDataFvGuid is not patched. that's why autopatcher doesn't work on this model ... But you are close to discover warm water ...
And you apply patch to a backup of 1.8V chipset made with 3.3V CH341A programmer with clamps. What's the odds that backup is ok? Think, is for free!

[gsoft]

it will not work because Volume_NVRAM_EfiSystemNvDataFvGuid is not patched. that's why autopatcher doesn't work on this model ... But you are close to discover warm water ...
And you apply patch to a backup of 1.8V chipset made with 3.3V CH341A programmer with clamps. What's the odds that backup is ok? Think, is for free!

So there is no way for me to have a working laptop agaim!? Because I not have a good backup??

[volinakis]

So there is no way for me to have a working laptop agaim!? Because I not have a good backup??

there is but you have to remove bios chipset from board with hot air gun and use programmer adapter to write it, then solder back. Write serial number.

[Markus1741]

La La ....

[gsoft]

there is but you have to remove bios chipset from board with hot air gun and use programmer adapter to write it, then solder back. Write serial number.

This is the S/N PF-26H4AM.

Why I can't use the soic clamp?