Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Are you referring to Safe Mode?
To start Safe Mode:
1. Turn off the device.
2. Press and hold the Power/Lock key for one or two seconds to turn on the device.
3. When the Samsung logo displays, press and hold the Volume down key until the lock screen displays. When the lock screen displays Safe mode will be shown in the lower-left corner of the screen.
To exit Safe mode:
Press the Power/Lock key and then touch Restart.