OOPS, SOLUTION to the crazy mystery

[@stm32world]

Sorry about the audio in this one - don't know what happened.

[@niclash]

So the code for the STM32F411 wasn't identical?

[@stm32world]

There was one declaration different - which was so far fetched I didn't even bother to check.

[@stm32world]

And I know it's embarrassing - hence the video title ;)