I recently needed to extract the BIOS/UEFI Image from a Lenovo BIOS Update Exe file. I didn’t see any written information on how to extract the BIOS image file from the Lenovo Update EXE file, so I wrote up some instructions on how to do so in case it helps anyone else down the road.
For example, from https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/1-series/1-15ijl7/downloads/driver-list/component?name=BIOS%2FUEFI, the BIOS update downloads as htcn28ww.exe. Trying to run this executable will result in an error message on any host that is not the intended host. But, it is possible to recover the UEFI image by using innoextract and 7-zip.
The process is simple: download a release version of innoextract (or compile it from source yourself!). Run innoextract from a windows Command Prompt:
Extracting "Lenovo BIOS Update Utility" - setup data version 5.5.7 (unicode)
- "code$GetExtractPath\install.bat" - overwritten
The resulting files are dumped into a newly created directory, code$GetExtractPath. Navigate to this directory, and use 7-zip to extract HTCN28WW.exe by right clicking the file and using the 7-zip context menu to Extract here.
The file BIOS.fd is the BIOS image file. It will load properly into UEFITool for additional analysis.
I hope that is helpful to someone else!