@ElTico @collectifission @eliasp That's not always true. Only some motherboards have that feature of dual BIOS. In fact, its how I got my current motherboard for my PC for £20. It was 'faulty' no boot, and couldn't get into the BIOS, and didn't have the flash from usb drive feature either. I used an EPROM programmer to reflash the chip, and it booted right up. no dual BIOS to save the day.
Still, your point is valid, car should have multiple fail safe from broken updates.