Nrf52840 dongle reset to factory image for desktop nrf connect app

Hello, 

I am trying to factory reset 2 nrf52840 dongles that I had very long ago with unknow applications on the dongles. When I erased and installed the image of nrf_desktop app under nrf/applications the dongle is appearing as Dongle nRF52 Desktop but I seem not be able to Start scan and I am getting following error:

14:22:48.409	Selected device with s/n 139B58A3AD095838
14:22:48.415	Device setup completed
14:22:48.415	Device has no serial port. Cannot open device.

Any idea what I might be doing wrong? I only want the factory image on the usb dongle so that I can sniff and read my other BLE devices what they are sending and having in their Characteristics.

The setup I have is nrf52840 dongle using the nrf_desktop application built using vscode nrfconnect extension. Version of sdk is v2.5.3.

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