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I've trying to play Gunners Heaven with PSX4All. The game loads fine but after the player selection it hangs. Could anyone confirm this? I've tried with different versions of the emulator and with different bios and also trying tweaking the settings. Could it be my game file? It works with my PSX emulators on PC. I had to convert it from .ecm to .bin though. However, I converted Harmful Park the same way and it works flawlessly in my RG350M.

Thanks. Your suggestion wasn't the solution, because I was using the same bios. However, it gave me the hint to find the problem. I had Core options, HLE emulated BIOS: on. As soon as I turned it off: problem solved. It was also affecting several other games which I had tried. Some didn't load, lacked sound or music or had other issues. On the other hand some other games weren't affected. Now all problems gone.