@ Kevin on the forum.xda-developper.com you will find all originals NVM (version 61) for the 4 series (xxpusxxx4 , xxoledxx4). (thank’s to forum.xda-developers.com). But Its possible to copy your actual NVM on a USB drive with the factory mode (first step in my guide).
It’s possible to engage the AI with option codes but not completly. The fisrt time I erase some caracters in the original file and a software ugrade in the night restore the NVM file with all the caracters of the 805 (I changed the name of tv before and the option codes I found in a shop). After this upgrade I tweak the NVM file in comparison with the 804 one and did a lot of tests to conserve all options of the 804 (dual sat, audio speakers that are not the same… So the NVM file is a 805 one with tweaks.