I tried to load the 4.0.6 software, and my pixhawk 1 crashed

I’m using an older pixhawk 1, and, as per message, I tried to upload the A.P. 4.0.6 software, and the upload failed. Now I get no “hello” melody and only the small leds light (flicker). I tried reloading the software from the start, but no port is seen.
What happened here?
Now what to do?