Bring pork out of fridge 30 minutes before cooking.
Score rind a few times without cutting flesh.
Sprinkle rind with ½ Tablespoon coarse salt and cover with paper towel; set aside or refrigerate uncovered up to 24 hours.
Preheat air fryer to 400F/200C for 5 minutes.
Flip pork flesh side up; drizzle olive oil, sprinkle salt, black pepper, dried sage, and garlic granules; rub into meat.
Flip pork skin side up; drizzle olive oil and rub over skin.
Sprinkle sea salt evenly over pork skin.
Place pork in air fryer basket carefully.
Cook at 320F/160C for 50 minutes.
Increase air fryer heat to 400F/200C and cook 15-30 minutes until internal temperature reaches 155F-160F.
If crackling is not crispy, remove crackling from pork; cook crackling separately in air fryer for 5 minutes or until crispy.
Rest pork covered for 15-20 minutes before carving.
Serve and enjoy.