You could also flash Anduril for D4 with Aux support. D4S might work, but it’s not ideal as the part for the thermal regulation is made for a bigger part. Also the level mixing is off, as the D4S has more AMCs.
see here: How-To: D4 with Anduril + Aux support (windows)
But the whole process of installing (and flashing) is not a newbie task