Today I figured out how to remove the 'custom' pad lock from the boot screen. First you need to get Xposed installer.
Then, go to Google play or through Xposed search for Wanam Installer.
Next, Install and activate the module.
Then, Open Wanam, and go to 'Security Hacks' and under system check 'Fake System Starus'.
Hope this helped!
If this helped don't forget to hit thanks!
Sent from my SCH-I545 using xda app-developers app