from the MI FW readme:
LAUNCHING MEMORY CARD APPLICATIONS:
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- Press TRIANGLE on joypad 1.
- If installed, the Infinity Manager will appear and show a list of
installed applications.
-or-
- Press R1/R2/L2 on joypad 1.
- This will launch the following applications according to the button pressed :
R1 : "mc0:BOOT/BOOT.ELF"
R2 : "mc0:BOOT/BOOT2.ELF"
L2 : "mc0:BOOT/BOOT3.ELF"
LAUNCHING HDD APPLICATION (DEV2 MODE):
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- Press L1 on joypad 1.
- If correctly installed, the default application will be executed from the HDD.