I am using 3 nRF 52840 dongles and want to establish mesh network between them. So I flashed the dongle with the softdevice (s140_nrf52_6.0.0_softdevice), bootloader (mesh_bootloader_serial_gccarmemb_nrf52840_xxAA) and the application file (serial_nrf52840_xxAA_s140_6.0.0). All these hex files were present in the (nrf5_SDK_for_Mesh_v2.2.0_src) folder. I am flashing these files using nRF Connect windows application. I want to know are these files really flashed on to the dongle since all the Led's stopped glowing. What are the next steps after flashing. Also I don't see mu dongle on nRF Mesh mobile application but I can see the dongle on nRF Connect mobile application.
I have stored the SDK's in my C drive as follows: