DMC 1 issues

[Flaming59]

okay so there's a few things i wanna point out and some things i want to ask

1 Yamato crashes my game when trying to equip it. i have the yamato fixes on but every time i try to it just... crashes. and to my knowledge i can't find anything about it anywhere. it also just disappears if i reload my save after getting it. so assistance would be appreciated

2 weapon switching crashes game if on.

3 when replaying a mission from mission select it... doesn't reply the entire thing. it just drops me off at the start of the stage but will not replay any of the events.

4. when using infini magic points it wont allow me to go into dt if the bar is full. but it will if i use dt then refil the magic bar

questions

2. what does sparda fixes mean? ik it puts devil trigger on it but anything else