WHILE DRIVING ON CITY STREET VEHICLE LOST ALL PROPULSION WITH WARNING LIGHTS ON. PUSHED CAR TO SAFE AREA AND NOTICED BURNING SMELL WHICH WAS GETTING WORSE. EVACUATED VEHICLE AND NOTICED BURNING SMELL INTENSIFYING. TOWED TO DEALERSHIP, WHERE SOFTWARE UPDATE WAS PERFORMED AS WELL AS BOTH CATALYTIC CONVERTERS REPLACED WITH ASSOCIATED EXHAUST PIPING DUE TO SEVERE HEAT DAMAGE. I WAS INFORMED THAT THE RECENT OVER THE AIR UPDATE CAUSED THE FUEL MIX TO BE RICH AND THE EXHAUST TEMPERATURE TO EXCEED SAFE LIMITS. ENTIRE VEHICLE COULD HAVE BURNED WHICH WOULD HAVE IGNITED THE LITHIUM BATTERIES CAUSING AN EXPLOSION.