Unable to Write Software to Newly Purchased USB Dongle

[Tomoyuki Matsuda]

I'm attempting to write software onto a newly purchased nRF52840 dongle using nRF Connect for desktop, but I'm unable to do so. My environment is Ubuntu 24.042 LTS. The LED is slowly blinking red, confirming that the nRF52840 dongle is in DFU mode. I can select the relevant dongle from the "SELECT DEVICE" option in the nRF Connect for desktop, but the log displays "Error:Failed with exit code 1. Failed to device info one or more devices: *E54A0C89118 : [sfdu] serialport could not be opened, code:FileOpenFailed. Message: Operation device-info failed,[sdfu]serialport could not be opened," and the "Device memory layout" cannot be verified. Although the Write button is clickable, the log again shows "Error:Failed with exit code 1. Failed to get firmware info one or more devices: *E54A0C89118 : [sfdu] serialport could not be opened, code:FileOpenFailed. Message: Operation fw-read-info failed,[sdfu]serialport could not be opened" and the writing process fails. Could you help identify any potential causes for this issue?

[Priyanka]

Hi,

There has been previously reported cases of no access to serial port which occured If your user is not in the correct group (typically dialout or plugdev). Could you maybe make sure that your user is in the dialout group:

sudo usermod -aG dialout $USER

Also, this might sound silly, but please could you try changing the cables?

-Priyanka