Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
Thanks for you help. I was able to resolve the problem. It was caused by operator head space! I thought that I had an ST-Link-V2-1, but in fact it is a V2. I hope I did not waste anyone's time but my own.
Corky