best image for dreambox 500s?

hi all just got a dreambox 500s whats the best image to install for use with 28e,13e and 19,2e sats? also i have 2 lnb cables coming in and i have both in my other sat box i have taken 1 of these out and put in creabox and got a f cable to loop from the lnb out on the dreambox to my other sat box but the singal is not there on my other box! does the lnb out on dreambox acutally work or am i doind something wrong? thanks all for your help

paul