Nagesh, Have a look @ this article (https://support.avg.com/SupportArticleView?urlname=Unlock-a-device-locked-by-AVG-AntiVirus-for-Android).
AVG Guru
Hi when am using this app. Very good but problem is am active after SIM Chang lock. The Mobil .now I forgot password and all I can't open my phone lock please help me .my display showing this device theft or stolen return to nnagesh1985@Gmail.com
Nagesh, Have a look @ this article (https://support.avg.com/SupportArticleView?urlname=Unlock-a-device-locked-by-AVG-AntiVirus-for-Android).
AVG Guru