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Recently I used the official Lenovo bios updater software on my ThinkBook 13s G3 ACN (20YA0005GE). The updating process failed and I got a black screen after powering the device. Of course I did not make an own backup before using the Lenovo bios updater.

I bought a CH341A programmer and was able to make a connection to the chip while it is still soldered on board. But I did not realise that the chip was a 16MB size and selected the wrong size (8Mbit / 1 MByte) before reading the content of my chip. So the dump I did before erasing the chip is only 1MByte big. I fear that I lost...

Hi, Not sure if im supposed to create a new thread for this or if this is the correct thread as per rules,
I have a Lenovo Thinkbook 13s G3 ACN 20YA0012US s/n R914BDZE which is stuck on a blinking display bootloop after updating bios.
I managed to dump the current corrupt bios. Im hoping I can have DMI transferred to latest bios if possible. Thanks...

This specification for the Lenovo ThinkBook 13s G3 ACN Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 13s G3 ACN boardview and 13s G3 ACN schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...

This specification for the Lenovo ThinkBook 13s G3 ACN Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 13s G3 ACN boardview and 13s G3 ACN schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE



Thank you Mazoot, lets see what a comparision between my version and your version brings up.

In the meantime I have set MTM, S/N and so on using Lenovo U1 golden key (available on github). I also backed up all my personal files and did a clean install of Windows 10 (which i wanted to do anyway..). The install process worked fine with the windows key i extracted from my backup.bin .

Fingerprint reader works again after the fresh install of windows.
...

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE

here you go man...

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE

The DMI seems to be in the part that was overwritten so you would need a fully working dump. Ive seen one on a well known russian repair forum,its a paid site so i can`t post the link.Hopefully someone will post it for you.

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE

For everyone else i'd like to attach the clean bios bin that i extracted and edited. Remember, this bios is made for ThinkBook 13s G3 ACN ....

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE



What's the point of posting a compressed file with a password! ...

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE

Thank you for your kind offer SMDFlea!

Edit: I removed the encrypted zip I posted because it violates the forum rules to post encrypted archives. Sorry

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE



Nice job,i`m glad the guide helped you. If you still have the bios backup post it here,we can see if the DMI is still in it to transfer to the new bios...

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE



Before flashing my new bios bin i thought i might check if something was left on the bios chip. To my surprise only the first 8Mbit of the chip had been erased through my first attempt. So I did a second dump of the chip and this file had 16MByte of data with the first MByte overwritten with FF. So i just had to merge both the first dump (1MByte) with the second dump in HxD hex editor and now i have a complete dump of my bricked bios chip....

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE

I used SMDFleas guide about how to extract Phoenix TDK bios.

The BIOS on my Thinkbook is a 16MB large file, so i had to adopt the process in the Hex editor in order to make it work. I read the old bricked bios bin with a CH341a programmer.

1.) extract cap file from Lenovo BIOS exe installer like described above

2.) open cap file in HxD hex editor, select area to cut (strg+e). Set start offset to 0 and end offset to 31F (Length 320). Delete selection....

Re: How to extract and edit a Lenovo Phoenix TDK Bios

SMDFlea, thank you for this guide! It helped me to extract a BIOS bin file for my Thinkbook 13s G3 ACN that got bricked due to a failed BIOS update. The BIOS on my Thinkbook is a 16MB large file, so i had to adopt the process in the Hex editor in order to make it work. I read the old bricked bios bin with a CH341a programmer.

As a noob i found this forum post through google. I will leave some notes for other noobs, hope that it helps someone to unbrick their device after failed bios flash.

1.) extract...

Re: BIOS Backup / extract 16MB .bin - Lenovo ThinkBook 13s G3 ACN - 20YA0005GE



Waiting your update solution ...