I was going to do some work with my Panda II board to begin developing an altitude heading reference system. I connected the USB cable and connected an 8.4V battery to the power input. I checked the battery to make sure the advertised voltage was correct. It showed 8.57V, 0.1mA. I connected the 3V3 port to a breadboard + rail and made a continuous circuit back through to the GND port. The two components circle in yellow got very hot (smoke). I disconnected the board from the external power and the on board red LED came on for a second and I disconnected the board from USB. I let everything cool and now when I connect the panda to USB only, it is not recognized, no on board LED, nothing. I’m assuming that it is ruined. Where did I go wrong? Would I have been okay if I had had some sort of device in the circuit where I have the yellow arrow drawn? I don’t want to make this mistake again obviously. But I thought everything I’ve done here should not have caused this problem. Is is possible to replace the indicated components that got hot and salvage the board at least for development?