You're looking for a link to the BIOS update for the Acer Aspire 5749. Here are some steps and resources to help you find and download the correct BIOS version:
After searching, I found a few links to BIOS updates for the Acer Aspire 5749: acer aspire 5749 bios link
the contents by right-clicking the file and selecting "Extract All". Run the Installer : Right-click the You're looking for a link to the BIOS
Download the latest version (v1.08 is commonly the final release for this model). : ✅ You found the link on acer
acer.com