For the people arguing interpretations here:
The second usage of equipment is referring to the equipment referenced in the first sentence, not your existing equipment. This is called "context".
This is not listed as a functional requirement - it's simply a use case scenario providing motive to use the item. "but you can only use it twice" is listed as a functional requirement. And yes, this item does say "increase the number of upgrade slots" not "recover missing slots".
Stop arguing these points already. They're officially dead.