Odin Sphere Leifthrasir [BLUS31601]

Can something be done to fix this issue? I've been unable to boot the game for weeks, not even on interpreter.

This is a definite game bug. Basically RPCS3 is too fast which causes some broken synchronization code in the game itself to fail. This can be fixed by making the game frame rate much lower as it starts up. See in the screenshot here how I slowed down the game to ~6 fps which seems to certainly get past the bug.

Actually, we speed up the game and therefore lower frame rate if you get what I mean. Anyway, just download cheat engine, attach to RPCS3, and use the speed hack at a factor 10 or more (just try 100). Then start the game. When you are past the trophy screen you can turn speed hack off and play as usual. I tested several times and it seems to only work with interpreter. LLVM fails every time, even slowed down to 0.1 fps.

Edit: Of course be careful with this tool. Download it here: https://github.com/cheat-engine/cheat-engine
Make damn sure not a remnant of this tool is in memory if you are going to play online games. Restart you computer after using it, because it will lead to VAC ban for example.

Thank you very much for the explanation. Unfortunately, I'm still unable to boot the game no matter the setting (10x -> 6 FPS, 20x -> 3 FPS... even 500x and 0.25x), I get the exact same result as before. I even tried lowering CPU frequency to its minimum and got the same thing.

What a miserable fate this beautiful game has to suffer...

I had this problem too but thanks to the sender of this note , Now its easier ...
I changed the method a little too ... instead of setting speedhack on lower value , set it on 500 ... hope you will get the screen under 5 tries .....
Also use the latest version of RPCS3 with the configuration of:
PPU Dec : Interpreter (fast)
SPU Dec : recompiler (ASMJIT)

good luck ...