Can't connect to nRF52840 dongle using nRF Connect for Desktop even though device is in DFU mode

[cjsmith]

Hi, 

I'm trying to connect to the nRF52840 dongle using nRF Connect for Desktop Programmer v4.5 on MacOS 15.2 so I can update the firmware.  The dongle has the red flashing LED.  

The log file shows:

2025-01-15T20:52:07.840Z INFO Getting serial port options from the persistent store for ECB146F79828.pc-nrfconnect-programmer
2025-01-15T20:52:07.841Z DEBUG Sending event "programmer: device connected"

but then the UI still shows all the device buttons as disabled and "Connect a device to display memory contents"  on the right hand pane. 

If I use nrfutil, I can see the device connected as 

ECB146F79828
product Open DFU Bootloader
ports /dev/tty.usbmodemECB146F798281
traits nordicDfu, nordicUsb, serialPorts, usb

If I use the Quick Start application it shows an Open DFU Bootloader device greyed out with Not Supported Yet

I'm sure this worked before. 

Thanks in advance, 

Colin

[Einar Thorsrud]

Hi Colin,

All Device related buttons will be grayed out until  you add a hex file (from "Add file"), and after that "Write" should turn white. Did you test that? (That said I would  have expected more log output after just connecting, so there seems to be an issue).

I tested this on Linux where it works, but I will try to reproduce on macOS and update here.