how can i set breakpoint before the game loads any assets?

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Under "Debug", uncheck "Run on Load". Then open the game (it will be paused.)

If the data is already loaded at this point, it means it's compiled into the game's binary. Sometimes games do this - they may even have preloaded data that can also be found under USRDIR.

This means it's part of the EBOOT.

But games can (this is rare) load at a different address. If it isn't loaded yet with the above steps, you can now step through to find out when it is.

As for checking when games load from files, you can set a breakpoint inside the zz_sceIoRead function (which is the stub that calls sceIoRead - games can't/don't call sceIoRead directly, they always use the stub.)

-[Unknown]