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factory reset nrf52-dk

Hello Nordic,

I've acquired several nrf52-dks and I use them almost exclusively to flash with nrfConnect on the PC.

To learn more about nrf programming I started with Segger Embedded Studio, easy installation so far all right.

Now I want to reuse the nrf52-dk with nrfConnect.

What do I have to do?

I asked this some time ago, but cannot find the thread anymore.

I remember this:

- download a binary file named "J-Link OB-SAM3U128-V2-NordicSemi 170724.bin"

- drag and drop it onto the nrf52-dk

- power cycle

BUT: This doesn't work. Do I miss a step? Press the IF Boot Button on power-on?