An early PlayStation Vita backwards compatibility fatality was Criminal Girls, which was removed from Sony's official backwards compatibility shortly after the system's debut late last year due to sound issues.
The PSP RPG and its erotic undertones are back alive and well today. Nippon Ichi posted notice that the system's version 1.52 firmware fixes the sound issues, and the game is officially back on the backwards compatibility list.
Outside of the Criminal Girls fix, Sony has confirmed with Japanese press outlets that the update fixed an issue where the some 3G systems would not recognize an inserted SIM card.
Source
http://andriasang.com/comzo1/criminal_girls_vita_glitch/
Thank you Sony for saving tits, ass, and loli for all who want it.