If you can’t find the BIOS file, but need to fix a specific problem:
If you go hunting for a BIOS update for the 5749, you will often find yourself redirected to pages for the or 5750G . This is because the 5749 is essentially a regional variant or a budget stripped-down sibling of the 5750 series. acer aspire 5749 bios link
Identify the latest version (e.g., v1.06 or later if listed) and click the BIOS Update Procedure If you can’t find the BIOS file, but
The BIOS situation for the Acer Aspire 5749 is a cautionary tale. It is a stable machine, but updating the BIOS is an act of "digital archaeology." acer aspire 5749 bios link
: A previous stable release used for baseline hardware support. How to Safely Update Your BIOS