Hi, i am using miui 11. When i make call a number, it is dialing about 30-60 seconds later. The system was slowing little, but i have not any problem. I roll back factory setting, but it was not solved my problem. After 3-5 hours virus occurs again. On safe mode i am calling normally, there is no problem. Can anyone help me? Can i clear the virus or a create a clean factory rom?