Still Not Working...

I am still trying to put old school games on my PSP but it's still not working. I have a 3.90-M33 firmware and it says that the game can not be started. Any advice? Thanks.

Don't you have a slim?

I have the phat psp.

Obtain the 1.50 EBOOT and the 1.50 kernel installer from http://dark-alex.org(Click the PSP thing then scroll down to 1.50 Kernel)

I'll edit this post with instructions later (15mins)

You don't need the 1.50 EBOOT, just the installer.
Put the 150k_installer folder in the GAME folder and run it.