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but when I try to connect with putty or other terminal - there is nothing (no messages, no prompt).
the board file for that fw is here https://github.com/espruino/Espruino/blob/master/boards/NUCLEOF411RE.py so it has serial console on pins a2,a3
virtual com is feature of onboard stlink debugger on the nucleo board so it won't work for your WeAct blackpill board, unless you have external stlink with virtual com too and connect it to pins a2,a3
fanoush
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 ...