The "setup" change depends on the disc according to the Region Code Operation instructs. I usually don't bother with it.For my 103, I find the "setup" change and the "wait 10 secs" after power-off to be unnecessary... but that 1st step is definitely important... plus not waiting too long (maybe no more than 15-30 secs) after the player's on-and-ready for executing the region switch.
_Man_