A guy asked me about v400 this week. v400 had CM-13 official builds, but no CM-14.1, although its source is still in CyanogenMod’s Github repo. The problem is that no maintainer has this device to test changes and maintain official builds.
So, I got its source tree and built it! Saulo, the guy who asked me about it tested and told me it is working. The build is in the link below.
WARNING: This is what I call a blind build (I don’t have the device to test).
I can keep monthly builds for this, just to help v400 owners. I’ll create a section for this device here. If you want to know how to onstall this build, check CyanogenMod’s wiki.