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STM32F765 can use stlink to burn firmware via SWD, but can't access bootloader.

yushangchen
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I am building a circuit board using STM32F765. After building it I can use stlink to burn the firmware (stm32 utility) via SWD and read the chip correctly, but I can't get into the bootloader and I can't use the serial port (USB) to read the chip on my PC.
Make sure the power supply is normal. I'm not sure what's going on here.

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