Embedded bootloader
The embedded bootloader mode is used to reprogram the Flash memory using one of the
following serial interfaces:
• USART1 (PA9/PA10)
• USART3 (PB10/11 and PC10/11)
• CAN2 (PB5/13)
• USB OTG FS (PA11/12) in Device mode (DFU: device firmware upgrade).