Disclaimer: The BIOS should be the exact same which Lenovo published on Google Drive (state of 30.12.2020) but is (along with the guide) supplied without any warrenty. I am not liable if you brick your Laptop!
💾 Mirrored files: c940-betabios.zip
Download the mirrored files from the link above and extract the ZIP-archive.
Set up a USB stick with a single FAT 32 partition.
shell file.zip. This archive has the necessary files to boot your Lenovo C940 to a state that it can load the BIOS file.
Copy the resulting files and directories to the USB stick
The BIOS itself is in
7z x C940AudioTest.7z to unpack this archive.
AUCN57WW.efi to the USB stick.
Turn off your C940.
Use Fn + Power Button to boot in to the NOLO (sp?) interface.
Press ESC to skip startup.nsh. (You only have about three seconds.)
fs0: to go to the USB stick directory.
AUCN57WW.efi to flash the new BIOS.
Alternative mirror host: https://cloud.libre.moe/s/3H3CMZxrFdTQcJ9
You can use these checkums to check if your download is identical to the files I uploaded. Please verify that the checksums are identical to make sure your download was not corrupted.
|shell file (flash tool).zip||
These checksums were generated using Dolphin v22.04.01.