joker97: I see.
Why didn't you download the 8.1 Rom (and install via self activating uefi?)
I guessed that I could not do 8.1, because my laptop was installed with 8.0. But, it worked!
Not sure what you mean with self activating UEFI. I have put an EI.CFG file in the sources folder of the ISO, then I could skip the "Enter serial" step (not sure if that is a required step otherwise), afterwards removed key with slmgr.exe /upk and then slui 3 to enter the OEM key.
So, the retail ISO accepted the OEM key after installation.
Asus says that they don't have the clean install key. I should ring the Auckland office myself to see whether they still have the DVD... I should let Asus do it anyway, because when I do it myself, my warranty is void they said...
Really bad support from Asus in this case.