We have already designed and fabricated the PCB in our project using STM32L452xx as our application processor.
We have used PA9 as USART1_Tx and PB7 as USART1_Rx pins, later when we were unable to download our code using boot loader, we learnt that we should have used PA9 and PA10 as USART_Tx and USART1_Rx, now its not possible to change the pin from PB7 to PA10. So what is the feasible solution. Can we rewrite Boot loader code by configuring PB7 and PA9 and flash the code using ST-link2 ? Or is there any other alternative solution ?