It seems that you might not need the update if you ran the update for Mario Kart (3.1E v2). A brickblocked version of US SSB worked first go on my friend's PAL 1.9s wiikey without having played SSB before.
Verbatim DVD+R DL burnt at 2.4x with ImgBurn with layerbreak
Verbatim DVD+R DL burnt at 2.4x with ImgBurn with layerbreak