STM32L452xx Bootloader on UART4

I'm looking at AN2606, section 65.1 and it looks like UART 4 can NOT be used by the bootloader to load FW into the part.

Can someone confirm that is true?

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Guru

AN2606 is usually pretty definitive about such things.

Your own loader can do as it wants, and implement a standard protocol like X-Modem, that'll work out-of-the-box with many terminal apps.

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