Re: Any chance to extract my y540 bios dmi info from corrupted bios backup?



1. Use Ch341a to backup the bios file.
2. Use UEFI tool to open backup file and the official bios file extracted by [url]https://github.com/LongSoft/InsydeImageExtractor[/url]
3. Compare the padding areas to see which part is different.
4. Try analyze the different parts to decide where the DMI info is.

But if the techinician didn't help you backup and flashed bios already with empty DMI info. There's nothing you can do. Try LVAR if your pc is from lenovo as well....

Re: Any chance to extract my y540 bios dmi info from corrupted bios backup?

Never mind. I solved it.

Using UEFITool to open backup image file and found an padding area at the start of bios region, which is from 60000 to 6CCFFF. After comparing with official bios image, this padding area should be DMI info area.

So I replace with the padding area and flashed it into bios chip by ch341a, then I got my dmi info back, including uuid, win10 license, sn, etc...

Hope it would help if anyone else encountered the same problem.

...

Hi, I am a Legion Y540 user and I bricked my laptop downgrading from 41ww bios to 26ww, which was definitely Lenovo's fault.

But I bought a ch3341a programmer. After backing up the corrupted bios, I flashed the stock bios successfully, but it turned out many motherboard variables are missing.

Then I found a tool called LVAR by lenovo and wrote most of the dmi variables back refering to my original box and labels on my laptop, including product name, mtm number, sn, etc..

But for other variables, it's really hard to know the original value.

Is...

Re: Lenono Legion Y545 Failed Bios Update. Program Chip?



I have a Y540 and bios fails as welll after I downgrade from bhcn41ww. The one you post about usb bios recovery doesn't work for me as well. Do you have any progress on CH341A force flashing?...