http://124.222.62.86/yd-data/YD-STM32F407Vx-mini/pyb407-25m.hex
http://124.222.62.86/yd-data/YD-STM32F407Vx-mini/STM32F407Vx-MINI-SIZE.pdf
http://124.222.62.86/yd-data/YD-STM32F407Vx-mini/YD-STM32F407VXMINI-SCH.pdf