Hi,

if you have Anti-Theft installed and enabled, you had to insert your PIN at some point. In this case, the only thing that will help (since you are not connected to avast! Account) is to uninstall both Mobile Security and Anti-Theft apps and reinstall again, there is no backdoor for accessing without a PIN. A guide on how to uninstall Anti-Theft can be found in the Anti-Theft subforum, depending on your device and installation, some of the guides there might not work for you, but some should.

Filip