Paradox on the show again: They have released their 1st patch for PS2 games,1st title is Ridge Racer 5 . This patch allows the backup to run with swap trick method combined with the use of PS Utility Disk.
For more you can read an extract of their .nfo file :
"...There are 2-3 ways to play a backup game on the PS2 by using the swap trick. We found an easy way that allow you to swap the original cd only 1 time. Boot with the original PS2 Utility Disk, swap with backup cd and play the game. But you need to apply our patch to use this easy swap trick. So, create the imagefile for your game and apply the patch..."
You can download it over here .