Phantasy Star 2: End game No Audio & Nei Sword Crash FIX

Speaking to Lutz after colecting all 8 pieces of Nei Equipment in the Esper Mansion will cause the game's audio to cut out permanently, and using the Nei Sword will cause the game to crash.

This bug is present in this collection and the original cartridge version of the game. When I originally wrote this guide, I could not find empirical evidence of this happening in the cartridge version of the game, however I have seen more reports of it allegedly occurring in that version as well.

This bug is thankfully easy to fix, simply follow the steps below.

STEP 1:
In the Esper Mansion, speak with Lutz for the first time to trigger the bug.
Finish the cutscene with Lutz, and there should be no audio at all.

STEP 2:
Repeatedly press the START button (spam it) until you hear the game's "pause" and "unpause" noise. Once you hear the noise, ensure the game is unpaused.

STEP 3:
Speak with Lutz again, and the game's music will return. You've now repaired your save of Phantasy Star 2. Not only does this restore the game's sound effects and music, but it also makes it so the Nei Sword works properly, and does not crash the game.

Hopefully this guide could help you out, and I hope you enjoy the ending of Phantasy Star 2. :)