ei.cfg can be modified to install any desired version of Windows 7.
You can extract the files of the ISO and place them on a USB drive with the modified ei.cfg and boot to USB from the machine to do a reinstall if need be.
Alternatively, you can extract all of the ISO files of any version you choose and delete the ei.cfg file entirely from the "Windows 7 [version]\sources\" directory and boot from USB and you will be greeted with a prompt asking what version you would like to install.
The only important factor is that you get the according version for the computer's processing architecture (x64 or x86).
Last edited by GiGo101010; 02-22-2013 at 08:26 PM..
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