Dark-AleX - PSP Developer
Go there and get the 1.50 kernal for 3.90m33
Then go to
PSP Downloads | 1.50 EBOOT and get the 1.50 EBOOT.
Then put the 1.50 EBOOT, renamed to 150, on the root of your memory stick.
Then put that kernal folder in the GAME folder.
And run it on the psp.