Thanks for the awesome video this happened to us on race day today had us scratching our head and found this video unhooked ecu for the entire trip to the track plugged up reinstalled software from sd card and car came back to life and was able to race because of your video
best way to unbrick one is to try and load firmware and unplug it from power. Then you can load the proper firmware on no problem. Used to do it all the time.