How do I remove the screen lock that I placed on my device from the online android device manager?
I had the exact same issue. Totally frustrating! I finally figured out the solution. Go to "Settings." Find the tab or section that shows your lock screen options. Mine was found under the "Display" tab. Choose "lock screen." Type in the password used in Android Device Manager. You should now be asked what Screen Security option you want to use. After selecting this option, you will be free from Android Device Manager's grip!