Yes, as BBW said, this is missing an instruction to release the ZIF connector left of the top screw. The latch needs to be flipped up on the lower side of the plug.
As others have mentioned, the topmost red connector HAS A CLAMP that you need to flip up. It seems like the creator of this guide has a 3ds with older board revision. With multiple people already having brought up the issue, the creator should absolutely update this guide to note the differences as others have already broken their devices due to this guide.
Lorsqu'il en aura reçu, il pourra afficher un graphique de sa réputation au fil du temps.
Voici un aperçu de ce à quoi ressemble ce graphique :
Aucun point de réputation obtenu pour l'instant.