nrf51dk - Failed to load readback protection status: device setup not found

Hi. I am returning to developing on Nordic devices after some time away, enticed back by nrfConnect / VSCode support for MacOS. I am running MacOs Monterey 12.1 and I have installed the latest versions of the nrf Connect, Segger tools and sdk. 

After connecting to the board via a JLink Lite via the Debug In connector, and using JLink Commander to issue an MSDDisable command via SWD, I can now connect to the board via the JLink Lite using nrfjprog and can successfully flash the board from VSCode. However, when i use the Programmer (v2.2.0) tool it reports that it 'Failed to load readback protection status: device setup not found'.

When I connect directly to the boards USB port, I get the same message from Programmer, but can't access the board via nrfjprog or flash from VSCode

Is this expected behaviour? Ideally I would like to flash the board directly via the USB port without the JLink Lite. I would also like to use the Programmer tool if that was possible.

Thanks in advance for any help that you can offer

Gavin

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