I've been trying to get a correct response to Arduino (SparkFun Pro Micro 3.3V) from my BaseCam SimpleBGC 32-bit Tiny board. I'm using CMD_BOARD_INFO command. While in GUI's debug tab the responce looks correct:
It's because 3.3V Arduino's serial port cannot correctly operate on a default baudrate (115200). Lowering the baudrate solves the problem (e.g. 57600).