Preheat oven to 325°. Grease 2 (9x5 inch) loaf pans.
Sprinkle blueberries with 2 tbsps of flour. Toss gently; set aside.
Place boiling water in a large bowl. Add butter and stir until melted.
Add orange juice, eggs, and sugar. Mix well.
Stir in remaining flour, baking powder, baking soda, and salt.
Fold in blueberries.
Pour into prepared loaf plans.
Combine sugar, flour, and cinnamon. Cut in butter until mixture is crumbly. Sprinkle over batter in loaf plan.
Bake at 325℉ for 1 hour or until pick inserted in the center comes out clean.
Cool for 10 mins.