Pork ribs for 1.5 hours in the oven in Barbecue sauce

Hello, My name is Kostya, in today's lesson I will show you how to cook pork ribs in the oven with an ideal degree of roasting, spending less than an hour and a half on it
Cooking stages:
Stage 1: heating top/bottom, temperature 250, cooking time: 20 minutes
Stage 2: heating top/bottom, temperature 180, cooking time: 45 minutes
Stage 3: heating the grill, cooking time: before caramelizing the Barbecue sauce, it took me 5 minutes (if there is no Grill mode, use the top/bottom mode at maximum temperature)
Weight and name of ingredients:
Ribs - 900 grams, size 30 by 12 centimeters
Salt - 2 teaspoons
Cayenne pepper - 0.5 teaspoons
Cane sugar - 1 teaspoon
Smoked paprika - 1 teaspoon
MEGACHEF oyster sauce - 40 grams
Barbecue sauce (take some with the addition of fruits, for example, with mashed prunes) - 50 grams
Foil 20 microns