Does the EP121 Bios contain SLIC 2.1 (which identifies it as an ASUS Windows 7 OEM device) or does this unit use a retail version of Windows 7 key?
Thanks, I tried installing Win 7 Ultimate with an OEM key I had but it wouldn't activate. Same key I use on my main PC with a modded bios, and worked fine here. Not really sure what's up with that, so I just reinstalled again with a Home Premium OEM version of Win 7 and the key I got with my EP121. Would prefer to be on Ultimate though.
I'm not sure if I should be encouraging piracy but the OEM key has to match by manufacturer and the certificate...so in short, you have to have an ASUS Ultimate OEM key, bios is already ASUS, and an ASUS certificate. If you are really curious about your bios, google "SLIC toolkit 3.0" and that should tell you all the info you need.
It should be there (it is on mine)... the SLIC is labelled _ASUS_notebook_ or something. Usually soft BIOS emulators interfere with the SLIC toolkit. Make sure you're starting from a clean install without any such hacks.