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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
IvanJ
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 ...