Hi,As per app note AN2606, STM32F070x6 bootloader supports USART1/2, I2C1 and USB peripherals. However for STM32F070F6P6 (TSSOP 20pins), only USART1 and USB are feasible but they are also mutually exclusive due to PA9/10 (USART1) and PA11/12 (USB) sh...