1. Open the FlyMCU and configure as shown in the following figure. Please not in the block diagrams are the necessary reference setting.

2. Click search serial port, select the COM port corresponding to the development board, and select 115200 as bps Baud rate.

3. Select program file, file path: Project > Debug > obj > mdk.hex.

4. Click Start ISP to program and download.

5. After the download is completed, remove the P12 short-circuit cap of the development board, and power on the development board again to start the program.

Note: When using UART mode to download the program, P12 cap must be short circuited. After downloading, it must be removed, otherwise the program cannot run.