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[younginpark]

I am using the STM32F407IGT6 chip. However, when I connected JTAG, the symptoms shown in the picture appear. So I have completed the VDD or continuity test. Can you tell me the circuit diagram and the reason?

[Peter BENSCH]

Welcome @younginpark, to the community!

the pull resistor at BOOT0 have to be connected to GND instead of VDD.

BTW: the pull-up at NRST is not necessary, see the description of NRST in the respective reference manual.

Hope that helps?

Regards
/Peter

[younginpark]

I tried connecting BOOT0 to nothing or connecting it to GND.
NRST(R8) is not connected to anything other than a pull-up resistor.

Boot1 is currently in a null state with nothing connected.

[younginpark]

I tried connecting BOOT0 to nothing or connecting it to GND.
NRST(R8) is not connected to anything other than a pull-up resistor.
Still not working. Do you know why?
Boot1 is currently in a null state with nothing connected.