Thank you @IvanJ - I followed your steps, upload firmware via STM Cube went without any issues, installed Virtual COM, see COM7 (STMicroelectronics), but when I try to connect with putty or other terminal - there is nothing (no messages, no prompt).
I'm currently doing all of this using UART (on PA9/PA10).
Will try over ST-LINK ...
When you open Putty just press Enter on keyboard and type
reset() and press Enter again.
You will see...
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