I got this working on 4.91 CFW Evilnat CEX.
You
MUST install and use ManaGunZ to load the prototype game.
If using CEX CFW (or HEN), don't skip step 3 even though it says "HEN only". Otherwise loading the
EBOOT.BIN
file will just exit to the XMB menu.
If the
EBOOT.BIN
is not resigned, the game will
ONLY work on DEX (C)FW. Not sure if PEX CFW would work, but it probably won't.
For resigning, you should instead follow the "Step 3" of this guide:
https://www.psx-place.com/threads/guide-properly-sign-sprx-and-eboot-for-hen.24449/
Skip step 5. I don't know why this is mentioned in the instructions since there is very clearly no "assets" folder at all.
Notes:
The game folder (
TEST0123456
) doesn't need to be in the
hdd0:/GAME
folder. Backup loaders won't even know the game exists since there is no
PARAM.SFO
(and the same reason why you cannot create a valid ISO image of the game).
Console crashes (and hard reboots) when the game is quit through the XMB. Not sure if this is a CEX problem or in general a problem with the game.
To be completely honest, the instructions are somewhat poorly written and glosses over details like needing a DEX unit if the EBOOT isn't resigned, or, the EBOOT needing resigned if using HEN FW and not CEX CFW, as well.