if u get a blackscreen its cause u need a patch like on W@W u need a patch b4 the 1st patch so u can use it to get onto the bypassed like W@W did
so if you could download the 1.01 patch for instance (get the retail patch somewhere from psn link finder ?) you could install on a JB, transfer to 3.50 & bypass ?
not gonna try this, cause i was actually going to bed & was just checking NGU real quick.. turns out quick is about an hour