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USB Uart + i3-flasher - the kit that consists of the USB-UART adapter and the programming board is required to upload the firmware from the PC to the controller based on the STM32 processor. Also supports firmware upload to i3-networkbridge or i3-networkbridge-lora. To upload the firmware, you need to lift up the controller face panel and install the programming board in the connectors on the input board, as shown on the illustration. The USB-UART adapter is connected to the programming board according to the diagram. For proper operation using a Windows PC you will need to install the driver (https://www.st.com/en/development-tools/stsw-link009.html)

Controller connection diagram added to the photos