FEZT 18 use of third USART of STM32F401


In the board FEZ T18, is possible to use PC6/PC7 - USART6 as in STM32CubeIDE ?

I´m trying to use declarations:
myUart2 = UartController.FromName(STM32F4.UartPort.Usart6);
myUart2 = UartController.FromName(STM32F4.UartPort.Usart3);

and others, but i´m geting the error after compile:
“‘System.NullReferenceException’ em GHIElectronics.TinyCLR.Devices.Uart.dll”

thx !

I am guessing this requires to rebuild the core firmware

Thanks Gus, I suspected this