To download the BIOS for your Acer Aspire 5749 , the safest and most reliable method is through the official Acer Support Drivers and Manuals page. How to Find the Official Link
msinfo32, press Enter.F2 during boot → look for “BIOS Version / Vx.xx”msinfo32 → BIOS Version/DateIf you go hunting for a BIOS update for the 5749, you will often find yourself redirected to pages for the Aspire 5750 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
Do not download anything until you check what you currently have. To download the BIOS for your Acer Aspire
.fd file and a DOS flasher (e.g., phlash16.exe) to the USB.phlash16 /x BIOS.fdthe contents by right-clicking the file and selecting "Extract All". Run the Installer : Right-click the Press Windows + R , type msinfo32 , press Enter