We recently bought a 2011 Toyota Avalon Limited and last night my wife just discovered the navigation lockout. I contacted the salesman from the Toyota dealership and he said he would ask the service guys if there is a hack to override it - not holding my breath!
I found the LockPick site but I’m not sure if any of the LockPick applications will work. I also read about older Toyota vehicles have a service override by entering a series of button pushed that disable the override until you turn the car off.
If you find out anything, please post back. I will do the same.