Christopher, Don't know if this will help?.. Have a look @ this article (https://support.avg.com/SupportArticleView?urlname=Unlock-a-device-locked-by-AVG-AntiVirus-for-Android).
AVG Guru
My battery went flat on my Z3, once charged I switched my phone on to be met by the Avg lock screen, I entered my password which unlocked the AVG screen only to be met by another lock screen, so i rentered my password and got a message saying I had entered the wrong password, so i went to AVG help page and found I had done exactly what it says.
An so i then followed some more advise from there to no use, I then checked my emails and found one titled I had changed my sim, I had not attempted to do this so could not understand why this has happened, so far AVG have been no help at all. Does anyone have any advise, my phone won't even let me do a hard reset either.
chevchech
Christopher, Don't know if this will help?.. Have a look @ this article (https://support.avg.com/SupportArticleView?urlname=Unlock-a-device-locked-by-AVG-AntiVirus-for-Android).
AVG Guru