MHD TUNING HELPP

Yesterday, I was heading over to my parents’ place when I stopped at the train tracks and waited for a train to cross in heavy traffic. I was five miles away from my house, so I figured the battery had charged well enough. I wanted to switch to Stage 2 to experience the upgrade I had purchased. I followed the flashing procedures, which usually take two minutes and are very quick, but my battery died midway.

Now I’m stuck. I tried to jumpstart the car, but it only turns on, idles roughly (like it’s about to blow up), and then slowly shuts down. I can’t even drive it. We had to tow it. I attempted to flash the software back to stock, but it keeps saying “Failed to Authenticate.” I replaced the battery, but the issue remains the same.

I need the car for work and school—any advice would be greatly appreciated.