I specially didn't replaced any files, and didn't changed permission to original system. All that this update do is adding patched su version, which (againg, for safety) were renamed to "suandr", and then chmode this file to 4755 to give superuser permissions. So in order to get back to normal you just need to delete "suandr" from system/bin.
But if anything go wrong you'll need to backup your data using EE's backup app, and then apply so called golden update http://www.entourageedge.com/support...ate.golden.zip It will restore system to original factory state. To use, simply rename the file to update.zip and copy it to the root of an SD card or USB drive. Plug-in the storage device to the eDGe while it is powered off and when powering on the eDGe hold the 'menu' and rotate button for the first 5 seconds of start-up.