Help With Playing Umd After Downgrading

Ok, i followed the instructions and successfully downgraded my psp from 2.0 to 1.5 and got all the very cool emulators to work. Problem is, when i go to start a umd, it tells me i need to upgrade back to 2.0 to play them????? Any way around this? After all the effort of downgrading and getting the emulators, i don't wanna lose them. Can anyone help?
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Don't mind that guy...go to www.sonyxteam.com and get the version changer to make your PSP think it is a higher version than it is so you can play 2.00 games. This will not, however, work with SOCOM Fireteam Bravo or GTA:LCS because of new security coding.