Acer Aspire One BIOS Recovery

The Acer Aspire One has a built-in BIOS recovery routine, which can
boot into a minimal BIOS environment via a special boot block to
re-flash the BIOS, even if the system does not pass POST and does
otherwise not boot anymore. This procedure is also known as Crisis
Disk.

First format an USB flash drive with FAT. It does not need to be bootable.

Download the latest BIOS, and extract all files. Put both FLASHIT.EXE
and the BIOS file with FD suffix in the root directory of the flash
drive. The files must not be in a folder. Rename the BIOS file to
ZG5IA32.FD before proceeding. It only works with this exact filename.

Turn the AA1 off, and verify both battery and AC adapter are plugged in.

Press Fn and Esc simultaneously, keep them pressed and press the power
button. Release Fn+Esc after a few seconds. The power button starts
blinking at this point. Press it once. The AA1 will now access the
files on the flash drive and initiate flashing the BIOS. After a while
the power button stops blinking, and the AA1 reboots by itself. Wait
patiently.

If it doesn't reboot, but keeps blinking, wait at least a few minutes
before turning it off, and try again.