Charm Slot Unlock Era

How to unlock PUK code? unlock slot Hi guys Does anyone know how or if there is already a post on how to unlock the third and fourth weapon slots with gibbed? I skipped normal unlock 3rd insured slot dmz You start with one Talisman slot, but you can unlock three more for a total of four Talisman slots by defeating the following bosses along the critical story

unlock 2nd insured slot dmz I don't understand why, but whenever I click the lock hotkey, it makes the sound effect but doesn't actually unlock the slot