The VMOS 4.4 ROM you're referring to is likely based on Android 4.4 (KitKat), which was a significant release from Google back in 2013. Here's what I found:
The VMOS 4.4 ROM you're referring to is likely based on Android 4.4 (KitKat), which was a significant release from Google back in 2013. Here's what I found: