He called the parts supplier. On the line, a bored voice recognized the batch number and sighed. “Yeah, that batch. We had a handful returned last month. We patched the firmware on the later ones.” Patch. The word tasted like a promise and a risk. Reflashing might fix it — or brick it. He weighed the cost: a customer who needed the car back tonight, a guarantee he couldn’t break, and a warranty that would cover none of the labor.