Hi.
I bought a nRF 52840 dongle, followed the steps to install nrfutil, python requirements, flashed the dongle with 4.1.1 zip file in the nrfutil share/firmware folder as per instructions.
dongle can enter bootloader mode, can flash BLE Sniffer firmware, can be detected in MacBook Pro as /dev/cu.usbmodem101 and as COM3 in windows.
However, after flashing, dongle’s LED remain unlit when i plug it into the computer. In wireshark for both MacBook Pro and windows, I can see the nRF BLE interface, double click to capture the interface but there is totally no traffic displayed in the wireshark window.
Anyone encountered this and managed to solve this? Any help would be greatly appreciated. 
thank you!