Confirm the in Device Manager and match it in your flashing tool (e.g., GXDownloader or STM32CubeProgrammer). Standard baud rates to test include 115200 or 9600 . Execution Procedure :
A quick test: Disconnect the adapter RX from PCB TX. You will still see the error (sending works). Now, short the adapter RX to adapter TX (loopback). Type something in the terminal. Do you see the echo? If yes, the adapter works. Reconnect and proceed. Bootrom Error Wait For Get Please Check Stb Uart Receive
Press the button in the software before connecting anything. Confirm the in Device Manager and match it