Hi, I'm trying to flash my GT3C, but I'm stuck at when I connect the 4 pins to the radio. My computer plays the sound that a USB device has disconnected, which of course is the STM programmer, and then my radio lights up and beeps each second.

I've tried to reverse the pins but I get the same result.

If I try to flash while I'm holding the pins in the socket I get this message:

Error : Cannot communicate with the board.
Wrong board selection or check board power supply or check that a previous session is closed.
Error : < PROGRAM MEMORY programming failed.


So my big question is, is it supposed to "disconnect" from the computer when you plug it in the radio?

Is it supposed to beep continuously?

EDIT!

So, this didn't show up in the pdf guide, but on a youtube video. I have to de-solder the two SB1 and SB2 SMD resistors

Works fine now.