I put the oven on at 500 for 20minutes then put the ribs in, uncovered, and turn it down.
I usually sprinkle them with garlic powder and cook them at 275 with no water until they fall off the bone, two ½ to three ½ hours.
I check to see how they are doing.
I get nice crispy bits and they stay tender.

DH cooks them on the unlit side of the grill on the BBQ.It takes a very long time.
Forty minutes before serving he puts the BBQ sauce on them