The block diagram below provides an overview of the various microcontroller peripherals utilized in this code example, ... it explains how to set up the 8-Bit MDFU Client library in MCC to enable ...

According to Tabe 77 of Application note, bootloader of STM32F446 microcontroller doesn't support communicating over the USART2 peripheral. We will use USART3 peripheral to talk to the bootloader ...

If so, it absorbs the program code from the computer and transfers it into the AVR chip, in a specific location so as not to overwrite the bootloader. If the computer isn’t trying to upload any code, ...