Having the same issues with Avast Anti Theft PIN not working.
*Samsung Note 4*
Ran "Lock Simulation", but PIN would not deactivate siren nor unlock my device.
Verified and changed my PIN, and tried again. Still wouldn't work.
Logged into my online account, activated the "lock" and tried the PIN on my device again... Same results. Changed my PIN through online account, and tried all scenarios again - same unwanted results.nttkpx
Big fan of Avast; very disappointed.
