Problem is that Android is stuck on loading animation - system doesn’t start
When you start Android (with SuperSU built in) for the first time and open SuperSU app, do you accept that dialog where SuperSU asks to update itself and reboot? Because in my case Android is stuck on boot animation after I accept SuperSU update/installation.
I’m not an expert on this, but guys maybe we can try to port LineageOS (previously Cyanogenmod) to support VIM and VIM2? It has superuser support and additional privacy options almost out-of-the-box and it is open source