Step by step description for st-link debugging with arduino due

Hi,
I tried to debug an arduino due by the use of a st-link debugger. I think I connected the device corectly to the arduino and I update the ini. file in this way:

[env:due]
platform = atmelsam
board = due
framework = arduino
debug_tool = stlink
upload_protocol = stlink

But the debugging does not work.
My debugger was a ST_LINK V2 and I tried it with an China clone too.

Do anybody have a step by step manual, how to do the debugger working? Or a detailed video?

Thanks for your help!
Michael

Debugging a Due with a ST-Link V2 (original version) is directly referenced in

Please show the full current output of the “PIO Debug” task and your wiring between the due and the ST-Link V2.