We we're considering the retuning of the HSI at the stage if in-circuit programming. Here is where the question of the aging came up.

The baudrate in our hardware is set by DIP switches, but we will check if we can use this feature to increase stability. Have you made any experiences with this feature? Since the auto-baudrate can only be done with some specific recieved characters,...

Thank you very much for your answer. Yes that's exactly what I want to know. We use a STM32G070. Do you see any concerns if we use the hsi as a clocksource for the UART? Buadrate is below 115400 kbps. It should be communicating at least 10 years. No...