Hello this guide is great but it has some flaws (missing some steps) but I used an eXtremeRate GBA SP shell and they are the best ones to go with because they have It molded in a way to remove the Nintendo logo sticker and so you can put in a ips screen with out needing to trim and it is made out of a high quality plastic and it better than other third party shell and I used purple/blue color

Flip the console upside down and it will but don’t pull it will break hold it close to the console then slide it back