View Sonic Smart Board Unlock Key Combination.
You can press the following key combination with the buttons on the front of the device. When referring to the setting button I am referring to the Cogwheel which looks like a gear.
Button Lock & Unlock
Vol-, Vol-, setting, home
Vol+, Vol+, setting, home
Power Lock & Unlock
Vol-, vol+, setting, home
If this still does not resolve your issue please contact us and create a ticket.