Add the the brown sugar, sea salt, garlic powder, smoked paprika and pepper to a small bowl, and stir to combine
Remove membrane from back of ribs, and rub seasoning mix over ribs
Add water and apple cider vinegar to Instant Pot, and place trivet on bottom of pot
Place seasoned ribs on trivet, cover, move valve to sealing position, and hit Pressure Cook for 20 minutes
Allow to naturally release for 10 minutes, then move valve to quick release until pin drops.
Open lid, remove ribs to foil lined baking sheet, and brush barbecue sauce over ribs
Place ribs in oven, and broil for 5 minutes or until ribs bubble and look crisp
Remove ribs from oven, cut, and enjoy!