Oh of course! I was going to suggest just using Region4 booting but yeah, HANS does the romfs stuff too. I've played with the CPU, region and FW spoof settings in all combinations and they all result in the same issue. This also happens in the gridlauncher. Like you, I am able to boot other carts from HANS, just not SM3DL. I suspect it's an incompatibility with HANS. If anyone with a different version/region console is reading, could you please try launching SM3DL through HANS and see if you get the same result?