In a small bowl, mix together the brown sugar, garlic powder, smoked paprika, oregano, and cumin.
Pat dry the ribs with a paper towel, then generously rub with the spice mixture.
In the bottom of the Instant Pot, drizzle 1 tablespoon of olive oil. Press the Saute button and heat the oil. Brown the ribs in the oil on all sides. Then, transfer to a plate and set aside.
Turn the Saute feature off. Pour the cider and liquid smoke into the bottom of the Instant Pot, and then place the metal trivet inside.
Place the ribs on top of the trivet. Close and lock the lid. Slide the valve to “Sealed.” Pressure cook the ribs on High manual pressure for 30 minutes.
When the ribs are finished cooking, allow the pressure to naturally release for 10 minutes. Then do a Quick Release to allow the remaining pressure to release.
Remove the ribs from the Instant Pot and place on a foil-lined baking sheet. Place in the oven to low broil for 3 minutes. If you like, you can brush the ribs with barbecue sauce, first, to allow the sauce to caramelize and the edges to crisp.
Carefully remove the ribs from the oven. Serve with additional barbecue sauce, if desired, and with your favorite side dishes.