Hi! I lost the bolt. I had to order a new one. I see from the last correspondence that you are trying to flash the v.1.0 motor. have you not solved the problem with the motor?
I had a poor quality axle. And one day I couldn't unscrew it. I reported this to the factory. You need to buy a new axle. Or you can make a new thread on the old axis. A spare part is always needed