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nRF5340 getting started guide for Mac

I recently purchased the nRF5340 PDK. I am working through the getting started guide and can't seem to get the Heart Rate Monitor demo application working.

Firstly, when I switch on the board LED1 does not light up.

I have installed the nRF5x Command Line Tools and am running the correct versions.

When I enter step 4b into the terminal I am given this error:

    ERROR: The arguments provided perform no operation. Use --help to read about

    ERROR: the valid argument combinations.

And when I enter step 4c into the terminal I am given this error:

    ERROR: JLinkARM DLL reported an error. Try again. If error condition

    ERROR: persists, run the same command again with argument --log, contact Nordic

    ERROR: Semiconductor and provide the generated log.log file to them.

Any advice to help solve these errors and run the Heart Rate Monitor demo application is much appreciated.

Thanks