Heat the olive oil in a skillet over medium heat. Add the pork pieces and brown them on all sides for a few minutes. Transfer the pork to the slow cooker.
Add the onion, carrots, potatoes, apples, and garlic to the slow cooker.
Pour in the hard cider and chicken broth. Stir in the thyme, salt, and pepper.
Cover and cook on low for 6 to 7 hours until the pork and vegetables are tender.
In a small bowl, whisk the flour with 2 tablespoons of the cooking liquid. Stir the mixture back into the stew to thicken it slightly. Cook 15 more minutes on low.