Preheat oven to 375 degrees, with rack in upper third. Gently stir together breadcrumbs, apple, raisins, prunes, honey, brandy, cinnamon, and salt in a medium bowl. Set filling aside.
Brush a sheet of phyllo with butter. Top with 2 sheets, and brush with butter; repeat. Spread with filling. Starting at a short end, roll to enclose filling. Transfer, seam side down, to a baking sheet lined with parchment paper.
Bake until golden brown, about 35 minutes. Transfer strudel to a wire rack; let cool 15 minutes. Sprinkle with cinnamon and sugar, and serve with whipped cream.