I did it, I managed to burn a few UMD disk (Copy of spyderman II) on my DVR-109 and guest what they work, I was suspecting that Pioneer was the OEM for the PSP reader.
Beign at it I also modified the firmware to do lightscribe on DVD (Not availlable yet) but it can do lighscribe CD as well!
Damnn I am goood
Here's the link for the modified firmware (Latest 1.40 off-course!)
click on him --->