is there stm32l4r9ai MCU has built-in bootloader ?

[ukn.1]

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[Danish1]

In my experience all stm32 have built-in bootloaders. Personally I don't use it, preferring to program and debug over JTAG / SWD.

For more information see AN2606 "STM32 microcontroller system memory boot mode" where they state that you have to apply bootloader activation pattern 6 for STM32L4Rxx/4Sxx

[KDJEM.1]

Hi @ukn.1​ ,

If you refer to AN2606 and precisely section 67 STM32L4Rxxx/4Sxxx devices bootloader, you can conclude that the bootloader is activated by applying Pattern 6.

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Kaouthar