Everytime I reboot my phone at startup my phone will be locked and avast will request my PIN. It says my IMEI was reported stolen. I can assure u its not a stolen phone since I bought it new straight from dealer. I already tried send sms as found and even do it from my avast online acc. The problem still persist. I already emailed my problem but am still waiting for answer.
Try to go to the settings (antitheft), assure the SIM is inside the device and clear the SIM list (settings>Clear SIM list).