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How to flash the application's binary file to STM32L4R5ZI MCU through UART using STM32 Cube programmer?
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AN2606 describes this process for the STM32L4R in section 65. The bootloader can be activated using pattern 6 (section 4.1), which describes the possibilities for activation.
Good luck!
Regards
/Peter
<edit>As I've just seen, you've essentially asked the same question.</edit>
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