I don't own the tv so cannot verify the information actually works but you could try this:
How to Reset Smart Hub on Samsung TV without PIN
You cannot reset the Smart Hub on Samsung smart TV without a PIN. But, you can reset the PIN of your TV. The default PIN is 0000. To change the Samsung TV PIN, turn on the TV and press the following on your remote: Mute > 8 > 2 > 4 > Power button.