PS3 crashes on story mode. engineer shortcut won't unlock p90.

So Im a rank 140, i have every gun unlocked including DLC guns, except for the P90 and the LMG you have to unlock via story mode. But the thing is I can't make it past Tashgar the 6th mission. My screen goes black and it kicks me off the game sending me to my dashboard thing. So I thought maybe a shortcut would help. It says it unlocks all base game progression upgrades, specialization, and PDWs. So I spent like $6 for the P90 that I really wanted, just to be disappointed once I saw it wasn't unlocked. I'm not mad, I love BF4 regardless. But Is there something you beautiful people at EA can do for me? Please let me know, I must have the P90!