Acer updated the BIOS for the original AA1, but there is hardly a reason to get excited about it. The only change documented in the release notes is related to the PXE boot feature of the LAN controller. Acer is apparently using the slightly updated RTL8103E now, instead of the previous RTL8102E, and they just updated the PXE ROM to support it.
If you're not using the PXE boot functionality or have a model with the older LAN controller there is no reason to update the BIOS at all. You can check it in the device manager in Windows, or with the following command in Linux.
อ้างอิง :
http://macles.blogspot.com/2009/04/acer-aspire-one-bios-3310.html