My pioneer sx-316 multi channel receiver is off on protected mode what do I do to restart

I read the instructions perhaps slightly differently perhaps. I take the instructions to mean first hold down tone and then hold standby/on key for three seconds. Have you tried doing it as two steps?

1 Switch the receiver into standby.
2 While holding down the TONE button, press and hold the
STANDBY/ON button for about three seconds.
3 When you see 'RESET?' appear in the display, press the ENTER button. OK? shows in the display.
4 Press SETUP to confirm.