New leased 2025 Nissan Murano vehicle 7,386 miles with recent software upgrade by Nissan dealer, Keyport, New Jersey. As I accelerated from a complete stop, the vehicle experienced an unintended increased excessive speed acceleration and when I applied the brakes to slow the vehicle, the acceleration wouldn't stop knocking me back into my headrest hurting my neck and right ankle. I had to shut off the vehicle to stop it. I then proceeded to attempt restarting to exit the roadway safely and it failed to start keeping in the lane of traffic. A message displayed to update the vehicle software which I did immediately and was unable to restart during vehicle requested update. I put on my hazard lights remaining in the vehicle as snow banks covered each side of the road and it wasn't safe to exit my vehicle with traffic and ice conditions. I was put into a situation where I could not exit the roadway and vehicles were approaching my rear as I was in a single lane roadway with traffic had going around me when safe to pass. After the upgrade I attempted to restart the vehicle and it would not until I opened the door and reapplied the brake pedal realizing that moment I injured my ankle pressing on the brakes so hard to stop my speeding vehicle. It did finally start after the 5th attempt afyer the software upgrade. After this event upon starting the vehicle I drove it off the roadway and the seats began to heat up hotter than tolerable and I could smell what seemed like burning plasti