I don't know if it's a problem with my flashcard, but when I activate the BIOS, the screen stays white in all games after updating. This happens to me on both GBA SP and DS Phat and DS Lite.
These functions would make a Pokémon illegal for movements and abilities that it does not possess, and in some cases giving a bad egg and corrupting the game.
I noticed something when I updated to 1.7: some games started to slow down, especially Super Mario Bros. 3.
I have a good SD and a GBA SP, so I had to downgrade.