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.

[Einar Thorsrud]

Hi,

I am sorry for the delay. Did you m ake any progress on this? I tested the Programmer app with the nrF52840 dongle on macOS 15.2 now, but did not see any issues. Just one thing, could it be that you did not select the device from here?

When clicked it should look like this, and you need to select the dongle:

If you do, and Add a file either by clicking "Add file" or dragging and dropping a .hex file, the "Write" button should no longer be grayed out.