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Issues with nRF542840 dongle on Windows 10

Hi,

I have got a nRF542840 dongle, and I have installed all the required programs (I got all from this website: https://www.nordicsemi.com/eng/Products/Getting-started-with-the-nRF52840-Dongle).

I would like your help because I am facing problem in step two (http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52%2Fdita%2Fnrf52%2Fdevelopment%2Fnrf52840_dongle%2Fgetting_started.html). The website said that after inserting the dongle in a USB port, the LED would start blinking RED and after some seconds my computer (running Windows 10 as SO) would recognize the device and maybe install the driver.

However after plugging the dongle into the USB Connector the both LED1 and LED 2 blinked (LED 1 - green and LED 2 - purple) for one second and turned off. If I press the SW1 key, the LED1 turns on showing a green light and if I press it again it turns off the LED1. 

Furthermore, I kept the Device Manager opened and anything changed while I plugged the dongle into the computer, looking like the Windows did not recognize the device.

Could you help me how can I control the dongle?

Regards

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