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Preheat the oven to 350 degrees F (175 degrees C). Grease and flour a 9-inch Bundt pan.
Beat sugar and butter together in a large bowl with an electric mixer until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in sour cream and vanilla extract.
Combine flour, baking powder, and salt; stir into butter mixture until just blended. Fold in blueberries; spoon ½ of the batter into the prepared pan.
Combine brown sugar, pecans, and cinnamon in a small bowl; sprinkle ½ of the mixture over batter in the pan. Spoon remaining batter on top, then sprinkle over remaining pecan mixture. Use a knife or thin spatula to swirl the sugar layer into the cake.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 1 hour. Cool briefly on a wire rack. Invert carefully onto a serving plate; dust with confectioners' sugar just before serving.