Here is the Modified BIOS that has been requested by a user I have unlocked all PCI Express Settings, Voltages, DRAM Settings, and HT Settings that were available. In no way will I or biosmods.com be held responsible for any failures in computer hardware, and by downloading this bios you agree to take responsibility for whatever you choose to do with this bios.
It was a very clean BIOS, easy to modify, and I doubt you'll have any problems. I was even able to unlock virtualization and onboard igx graphics options.
Here's the link: http://dl.dropbox.com/u/1525839/Bios/M5100A3.BIN
To flash correctly rename modded bios to 721A1P13.BIN and flash with the awdflash.exe available on the acer support website.
UPDATE: The new release version R01-A3 I have modded. I removed the PC health status unlocked options because I believe it is the reason why peoples flashes were failing. This looks good now. This includes the full unlock and overclocking options, and the link above has been updated to reflect the new version.