As "many of you have read" in my guide in http :// forums .qj .net/ psp-faqs-guides-tutorials/ 184748-guide-renpsp-faq-installation-usage-visual-novel-porting .html (remove spaces), RenPSP is not an exact port of the Ren'Py visual novel engine, which explains why you cannot simply shove in Ren'Py data into your PSP.
The solution to that is to port the games for the RenPSP. So far, I have only ported around seven games and have several more on my bucket list.
I need as much help as I can gather to continue the rest of my projects. You can PM me for more info or lookup "weetabix-su" in GitHub for all the ports that I've been working on.
Thanks in advance!