Hi I am Rupesh from India and I am using redmi note 4 and it runs MIUI9. while using some app it has requested to set a security pin and I have done it. Each and every time the phone is idle for 6 minutes the system gets locked and I have to enter the security lock ie., pin 1982. I don't want to enter the pin every time I mean I want to remove security lock ie pin. I remember the pin. I have searched the word pin in setting's but can't find it. I have searched web for how to remove security lock and found suggestions as "flash ROM", "hard reset" etc.,. Please suggest how to remove security lock without flashing, resetting etc.,. Regards, Rupesh.