Not 100% sure if this is old news but I haven't found such info around the web. And I'm also not sure if suggesting users to get the retail demos and debug updates from here. If the boss says go I'm all for editing this tutorial
This guide covers up your game conversion, from a Retail PSN Game demo into a Fully functional Debug PSN Full Game for use with Jailbreak.
Here's the procedure.
1) Search a download any PSN game DEMO
2) Open up PSN Demo Installer
3) From PSN Demo Installer, select your downloaded PSN DEMO (.pkg demo)
4) Create .pdb file
5) Turn on your PS3 in jailbreak mode and open up your FTP Server tool.
6) Select the upload function from PSN Demo Installer, fill it with your PS3 IP and upload the demo.
7) Now that your demo is on your PS3, you need to reboot the console without the jailbreak dongle.
8) Install the demo. Remember, console must be turned on without the jailbreak device.
9) Now reboot console in jailbreak mode
10) Search and download your game update but needs to be for debug consoles. Search around the web for debug pkgs. I won't provide such info. Google is your friend!
NOTE: The debug game update must be same region as the demo.
11) Install your debug game update through ★ Install package data from XMB
Well, this method is almost the same employed in this torrent. Tried it with 3-4 games. All working.