programmer with nrf52840 dongle don't work with Manjaro

Question

Hi, 
 I have problems to use nrf52840 dongle with Manjaro and nrf Programmer v3.0.3. Indeed, when I plug my dongle I have this view on programmer : 
 So I see only the numbers "2" and "3" instead of the "Open DFU Bootloader" message and the serial number of my device. Moreover, when I try to read my device I have the "Error when fetching device versions: readFwInfo error" 
 
 My device is in Bootloader mode as I see the red led flashing. 
 I tested two different dongles, changed the USB port but I always have the same result. Moreover, it's always the same number shown in the "select device panel" even if I change the dongle. And if I connect 2 dongles at the same time, I see only one device connected. 
 I have a dual-boot with a windows 10 on my machine and I succeed to read and write my dongle on windows. So I think it's a problem with Manjaro. Infos about my Manjaro version : 
 Manjaro Ruah : version 21.3.7 
 Has anyone had this problem before?

Michal · Accepted Answer

Hello Maureen, 
 Glad that we were able to find the error together. 
 To get the access to the serial ports "properly" you should add your user to the uucp group instead of chmod-ing the ports. 
 You can do it with the following command: 
 sudo usermod -a -G uucp $USER 
 I am not sure about the wrong identifiers unfortunately. 
 As for why the issue is only happening with dongles, I guess that there may be a difference between communicating via J-Link and directly via a UART-USB adapter. 
 Best regards, 
 Michal

programmer with nrf52840 dongle don't work with Manjaro

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