Un installing antitheft

I bought my sony experia neo v about 2 years back and anti theft was installed at that time. Now the phone lock it self on and off displaying the message " this phone is stolen’ then i have to swich off the phone by removing the battery. the password i have hiven during the installation also does not work. i want to reove anti theft completly from my phone.

you’ll need your password. Did you enter a password longer than 6 digits?

No just 4 digit. now its not working

did you pair with my.avast account? you can change PIN there!

Not pairing

did you try 0000?

Not working any damn thing >:(

replied via PN

I have got almost the smae problem. but i have remove the device from my.avast suddenly after a month the lock thing happen again. but i have remove the device in my avast how could i change my setting back? PLEASE HELP

hi i have same problem , i want remove avast from my mobil samsung note 2 . but how ? and how to add new device on my avast account ? please help