Solved
Systembootloader CANBUS in STM32f429I-DISC1
to use the canbus Pins from the systembootloader of stm32f429ZI PB13 needs to be disconected from VBUS_FD
There is no jumper or 0R, the pcb pad needs to be physically cut.
This was not a question, ill just leave this here in case i save someone's time and hairline.
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