Getting a bad clone is kinda tricky, the timing is so precise that we cannot define it, but, approximately, when saving, you must turn off the game about one second after the final point of "Do not turn off the console..." .
You may not succeed after the first try. The best way to obtain a result is to keep trying.
As PRAMA is a French website, I may advice you to visit english-speaking websites like Glitch City Laboratories where you could get more help.
Have a nice day