How To Install VIPER4Android on MIUI 9 (All Phones) Xiaomi started rolling out MIUI 9 for Mi Phones from August 11th based on Android Nougat(7.0+). A lot of users are having a problem to install Viper4Android on MIUI 9 based phones (Mi 6, Mi 5X, Redmi Note 4X Qualcomm, Mi MIX, Mi Note 2, Mi