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STM32F401 Nucleo - Flash Download Failed – Cortex M4

Hello, I’m new to STM32s having moved on from PICs and Arduinos and I’m using an STM32F401 Nucleo board with an STM32F401RE chip.

I’ve used STM32CubeMX and written a blinky LED so I know eveythings working
I’ve downloaded the STM32CubeF4 projects form here www.st.com/.../PF259243 and interested in getting the UART working \Projects\STM32F401RE-Nucleo\Examples\UART

It compiles OK but when I flash it I get the message Error : Flash Download Failed – Cortex M4.

The other four demo projects all compile and flash download OK. I ‘ve scoured the web but unable to find a solution. I suspect it’s something to do with Configure Flash Tools > Utilities

Any help really appreciated as the project I’m planning needs a UART.

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