Hello, your custom firmware saved me from having to order an older SD from the web (things are super hard to find nowadays).
So far, Metroid Zero Mission just crashes after the BIOS.
I'm trying to also play Pokemon Radical Red which does work...
Only thing drive me crazy is all these new horror games nowadays is its so dark, all time. I can't even play them. I understand they trying to create spooky but be creative a little, not just darkness with pop out scare scenes.