Bios Mods -The Best BIOS Update and Modification Source

Hello I am trying to update my bios. I selected the acer model I have and the most recent bios has "(not for upgrades)" after it. I am wonder if this is talking about the operating system, or that the bios should not be used to upgrade the previous bios. Im confused and I don't want to mess up my computer because of not understanding acers description.

http://us.acer.com/ac/en/US/content/drivers

Manufacturer Acer
Model Predator G3620 (SOCKET 0)
Chipset Vendor Intel
Chipset Model Ivy Bridge
Chipset Revision 09
Southbridge Vendor Intel
Southbridge Model P75/B75
Southbridge Revision 04

Brand American Megatrends Inc.
Version P11-A3
Date 10/18/2012

**Here is a picture of the bios download screen**
http://imgur.com/Y4UqH0g

Thanks,
Cody

It's not update Bios or EC Codes, but make some little changes to permit working better !
So Who is waiting for more changes into Code not need this Bios !
Regards

So its safe to install the latest bios, correct?