Resolved! Did I "brick" my "blue pill" board(s) - ST-LINK V2 (current firmware), STM32CubeIDE (1.9.0), trivial "blink LED" project in Debug configuration.
ST-Link V2, STM32F103C6T6A "blue pill", trivial program (version of blink LED), after pushing code to CPU (using STM32CubeIDE 1.9.0 and a current-firmware official ST-LINK V2), the board(s) appear "bricked" and don't respond to ST-LINK V2.I am in nee...