STM32L4A6 USART port selection for bootloader?

Bootloader only responding on PC10 and PC11, but not on PA2,PA3,

how to select a particular UART port for bootloader?

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Guru

It is typically looking for signal transitions on multiple pins, first one to see traffic wins the race.

Make sure the other RX pins are not noisy, ie data from a GPS/GNSS receiver that squawks at startup.

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