I just recently received an SL5500 i've tried using the method described at
here to load the prism2_cs (i'm honestly not sure how if its really a prism card, not sure how to find out, model # is SDWCFB-128), and whenever i insert the card i get a hard lockup, can't do anything without doing a full reset (if there's something better tell me).
i'm not sure what to do i'm tempted to try one of the open rom's but i haven't been brave enough yet.