Autobooting help needed for Slim with 3.90 m33-2

Okay, so, I've created a program called ChildBeGone.
I've completely finished it, and I am ready to release it.
It works by locking out little brother from older brother's PSP so they cannot delete stuff or upgrade the PSP to an official firmware.
As soon as you turn on the PSP, it is supposed to load up the game, but the only problem is, I can't get the PSP to use the autoboot function!

The program works fine, standalone, but once I try to use autoboot, nothing autoboots.
I've enabled the autorun function using the Recovery menu, and I put the EBOOT.PBP in the dir. ms0/PSP/GAME/BOOT/ but that didn't work.
So I tried different names for the folder. I tried using caps, and not using caps, and tried AUTOBOOT and AUTORUN but they didn't work...