HELP My Action Replay Max Duo for DSGBA won't boot up How do you fix it?

1/ With the console powered off, hold A+B.

2/ Power up the console while still holding A+B.

3/ As soon as the Nintendo screen is displayed, before our screen stating this product is not endorsed by Nintendo, press and hold Start and Select while keeping hold of A+B.

4/ Continue to hold these buttons until the Main Action Replay screen is displayed, then release. Your product is reset, and will accept codes once more. it worked for me and i have done it about 20 times