I have an Asus OEM Home Premium Win7 x86 upgrade DVD. It is customized well for a particular notebook, it uses almost the entire DVD space (unlike retail Win7 x86 DVD). Note that this Upgrade DVD does not use SLP, but instead includes a real usable key. Anyway, I tried to delete ei.cfg to allow it to install as Ultimate, but it turns out that the install.wim on the DVD only contains the Home Premium Image (I checked with imagex). So, I've found many threads describing how to delete an image from install.wim, but none explaining how to add one. Is this possible? Or is there some other way to enable Ultimate when install.wim only has the Home Premium image? In the alternative, is there some way to integrate all of the many Asus customizations from the OEM Home Premium DVD, to a retail win7 edition, or are at least some of them bound up in the install.wim file?