Try this forum section
Avast Mobile Apps >> https://forum.avast.com/index.php?board=66.0
are you sure it is avast? different pictures here > click the blue detailed steps button and scroll down
https://support.avast.com/support/solutions/articles/5000612416-avast-mobile-security-changing-a-sim-card-on-mobile-devices-with-avast-anti-theft-installed