Pixracer firmware upload via gdb

Hi, all

I am using black magic probe as gdb controller and trying to upload a new firmware on pixracer.
I have uploaded a firmware on pixhawk multiple times. So, I think I am familiar with firmware uploading via gdb.

However, I could not upload firmware with this error message.
-> Error erasing flash with vFlashErase packet

PS1. Note that I updated black magic probe firmware due to multiple firmware uploading failure. However, I couldn’t solve this problem.

PS2. There is no uploaded firmware and bootloader on my pixracer. So, I may not be able to upload firmware via “qgroundcontrol” or “make px4fmu-v4_default upload”