If you are using the T5 development board, you can directly connect the device to the PC via a Type-C interface data cable. The serial port driver chip on the board will drive the two serial ports of the T5 module separately, one is the programming serial port, and the other is the LOG serial port. Open the Tuya programming software (refer to section 3.4 above), select the serial port, baud rate 460800, as shown in the figure: (If there is no print, you can select another serial port)