It is based on Android Lollipop 5.1.1, but one amazing part is, you can run multiple Android versions up to Nougat using its Multi-Drive feature, and it's free to download.
Kususelwa ku-Android Lollipop 5.1.1, kodwa ingxenye eyodwa emangalisayo ukuthi, ungasebenzisa izinhlobo eziningi ze-Android kuze kufike kuNougat usebenzisa isici sayo seMulti-Drive, futhi kumahhala ukulanda.