Re: Iupdate bios Aspire 4752.

Hi,After downloading BIOS from Acer Support site, extract it, open the extracted folder, open DOS folder and find JE40124.ROM, you need to rename JE40124.ROM to JE40124.fd

There are some methods to try to recover the BIOS in this thread, see if it helps you.

http://community.acer.com/t5/Legacy-Laptops-and-Netbooks/Acer-Aspire-4752-BIOS-progress-bar-stuck-at-about-75/td-p/352447/page/2