PCAN FD1 CAN FD 1.1 MCU with CAN FD GD32C103: USART upgrade STM32G0B1: RM0444, DS13560, AN5096, USART1 (PA9, PA10) and DFU (PA11, PA12) STM32G431: RM0440, DS12589, AN5093, USART1 (PA9, PA10) and DFU (PA11, PA12) Refer to AN2606 to get what STM32 devices support