I did a quick search and couldn't find anything for ROMs for that device. The downside to more uncommon brands is there rarely is any development for them.
4.4 is a version of Android, not a ROM (in the usual sense). Updating to a newer version of Android is normally done by your carrier - it's sent to your phone over the air. But unless you're in a country in which the Evolveo is a common phone (and the phone can support 4.4 and the manufacturer wrote a 4.4 version of Android), he won't be getting an update.