We have just added a Undiluted Platinum FAQ section to the site. The UP FAQ should help in answering common questions asked by those who own a PSP with the Undiluted Platinum chip installed. The section is still under constructions but you will find a selection of questions already answered including how to run GTA: Vice City on firmware 2.71 using a simple modification.
If you have any issues that you need help with, please use the contact form to send them in. Any useful questions will be added to the FAQ list to share with others.
Warning: Using backups in the form of ISO images is illegal unless you own the game.