STM32 MCUs Wireless

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About flash download with STM32WL55

HiI am using STM32WL55I want to download firmware to MCU using system bootloader.I set pin4(PB6) to usart1_tx, and pin5(PB7) to usart1_rx.I installed Flash Loader Demonstrator Ver 2.8.0​I set BOOT0 pin(PH13, pin19) to hight and then power up.(of cour...