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I used STM32CubeProgrammer v2.1.0 in utuntu 18.04. Connect STM32F103ZET6 failed. Usb to serial port is WCH CH340G.

ljing.17
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13:05:04 : Serial Port ttyUSB0 is successfully opened.

13:05:04 : Port configuration: parity = even, baudrate = 115200, data-bit = 8, stop-bit = 1.0, flow-control = off

13:05:05 : Timeout error occured while waiting for acknowledgement.

13:05:05 : Timeout error occured while waiting for acknowledgement.

13:05:05 : Error: Activating device: KO. Please, verify the boot mode configuration and check the serial port configuration. Reset your device then try again...

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