Can the system BootLoader (USB DFU) of the STM32 update the external FLASH memory mapped through QSPI?

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I learned that the BootLoader of the STM32 system can update the firmware in the internal FLASH through USB UART CAN, etc. Can the same operation be performed if the external FLASH mapped through QSPI is used?

[Tesla DeLorean · Accepted solution]

A similar question was asked last week.

No. The System loader has no idea how to program the external memory, and memory-mapped only works for reading.

You'd need to build your own DFU Device implementation, supporting the memory you have chosen.

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Okay, I see. Thank you very much for your answer.