I've googled around. Haven't seen anything for your particular model, but the steps are similar for others.
1. Get a USB stick**
2. Download the latest BIOS, and put both FLASHIT.EXE and the BIOS file in the root directory of the stick.
3. Rename the BIOS file to ZG5IA32.FD***. Place the USB stick in your laptop (which should be turned off).
4. Make sure both battery and AC adapter are connected. Press Fn+Esc, keep it pressed and press the power button to turn the laptop on. Release Fn+Esc after a few seconds, the power button will be blinking. Press the power button once. The laptop will now initiate the BIOS flash, do not interrupt it under any circumstances. After a while the power button will stop blinking, and the laptop will reboot shortly after. Wait patiently.
5. The BIOS has been flashed and all settings reset to default.
If for some reason you made a mistake during the procedure and it doesn't reboot by itself wait 5 minutes before turning it off, just to be safe that it isn't still flashing the BIOS.
**The stick may have to be formatted as FAT16 or 32, though must are. Also, some sites said the USB stick should be formatted as a bootable drive, others did not mention this.
***I don't know if you really have to rename the file. Some sites claimed it was important. But they were also talking about the Acer Aspire One so it's possible the filename may be specific to that model. I would try the steps once without renaming the file. If that doesn't work, rename the file and try again.
If you want to see some more tips I found these by
googling acer bios recovery