Hey! I think I have an answer for most of you. [br]
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If the battery swap doesn’t works, open your GBA SP up and be assured that the screen ribbon cable is properly and fully plugged in the motherboard - and that the locks on both side of the ribbon port is properly pushed fully down (or up if it’s not plugged in a perpendicular position). Most of the time when I repair a GBA SP with that flickering thing going on, that’s what is happening.[br]
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Also, it sometimes can create a random restart on your GBA, so it’s kind of a sign that your GBA SP doesn’t receive properly the AC/Power from the battery to the screen.