I am trying Zephyr for first time and just want to get going on an example on an available evaluation board.
I found a match for:
https://docs.zephyrproject.org/latest/boards/arm/stm3210c_eval/doc/index.html
It was not very straitforward to follow since acquaintance with Zephyr is assumed.
In my case Windows host is used, so openocd install is left out in instruction.

Where I get stuck

Flashing over DFU works fine if done with ST supplied SW, but not as per instruction:

C:\Users\peterfromswe\Documents\Temp\zephyrproject\zephyr\samples\basic\blinky\build>ninja flash

[0/1] Flashing stm3210c_eval

Using runner: openocd

Open On-Chip Debugger 0.10.0 (2019-02-10) [https://github.com/sysprogs/openocd]

Licensed under GNU GPL v2

For bug reports, read

        http://openocd.org/doc/doxygen/bugs.html

Error: Debug adapter does not support any transports? Check config file order.

Error: unable to select a session transport. Can't continue.

shutdown command invoked

Any ideas on how to proceed?
/Peter