what do you need it for?
heres the one from anthony's toolbox, but its not even working, so don't post the hack.
Hack strongbox improvement slots out of 8 to 10
Search:24 ?? ?? 46 ?? ?? ?? 24 64 a3 a0 
Replace:24 64 ?? 46 ?? ?? ?? 24 64 a2 a2 
 

that hack was removed, it doesnt even work lol

instead use the grade 10 slots hack, you dont need the code, just download the KH ultra trainer
 

Basically makes every Weapon or Armour you obtain through Loot Boxes have 10 Slots on them.

Edit:

If you don't know what Slots are...

Slots are basically how much you can upgrade a weapon with a augment of your choosing or pre-attached already. There's also a Hack in the trainer which lets you always have clean slots, so you yourself can choose what augments available you want for the weapon. Like more damage/rof/physical defence etc.