<a href="http://www.geocities.jp/psp15emu/" target="_blank" >This Japanese hacker</a> has posted instructions of how to use a Single Memory Card to use the Swap Exploit on the PSP, ive posted the instructions emailed to be by fatisha (an English Translation), i cant guarentee they work as i dont have a 1.50 to test but heres the instructions here --> http://psp-news.dcemu.co.uk/singlememcardexploit.shtml