PS2 Need help with a modded game

[Mastered UI John]

I recentely found a fanmade version of gta san andreas beta for the ps2. I managed to convert the game's files into an iso and put the game into a usb to play from opl. The game works but the game freezes everytime at the loading screen at a specific place. I tested it on pcsx2 and it works just fine. But it won't work on a real ps2. What do I do?

(By the way I took an original gta sa 1.03 iso and replaced the files with the beta files. As I mentioned eariler, it works on pcsx2 but not on a real ps2)

 

[HWNJ]

You might lack the extra RAM from dev hardware.

 

[Mastered UI John]

You might lack the extra RAM from dev hardware.

I've never heard of extra dev ram. Anyway, why would it need extra ram if the mod is supposed to be a beta version of san andreas? By the way my ps2 bios is scph 75004

 

[GuilloteTesla]

Most dev kits has additional features used to develop the games.

Having a "beta" game doesn't mean that it's optimized or ready to be played on real hardware.

Take for example the unreleased PoC "Gears of War 3" for PS3. To be played, you would require a dev kit because it has 512 MB of RAM, while a retail PS3 has 256 MB. The game is fully working, no assets missing, it was just an unofficial experiment that was never optimzed.