Hi, It seems that I bricked by pixhack fmu-v2. It was power reset at some point in erasing stage in chibios-based firmware upload. When connected to PC it doesn’t show any serial port, no new device is recognized at all. Even tried on Linux no dmesg output on connection and no /dev/serial stuff. So I guess it needs flashing a boot loader. Correct me, if I am wrong.
So I found this guide http://ardupilot.org/dev/docs/using-DFU-to-load-bootloader.html but I cannot find the BOOT-pad on this board. Here is the board design https://github.com/CUAV88/Pixhack but I’ve no electronics background… I hope someone can help