Failed to flash devices nRF52840

[Shai.Oren]

Hi.

On my production line, the first station is an automatic flashing machine, it takes the components from the reel one by one, connect, flash my program and pack again in the reel.

I am using the nRFjprog commands like this:

nrfjprog --recover
nrfjprog -f nrf52 --program <program_file.hex location> --verify
nrfjprog --rbp all

I have a lot of failures (about 15%) and in all of them I got the same message:

Can you please help me to find the problem?

The flashing commands are wrong? Maybe the devices are broken?

This problem stops my production line so I need very fast response, Can I return the failed units and get others in return just to keep working while we are trying to solve this issue?.

Thanks

[Susheel Nuguru]

It is always best to debug nrfjprog issues with logs enabled. You can run --log with any command to get the details error report logged into a log.log file in the directory in which you run nrfjprog command.

     --log [<path>]          Enable logging.
                             Default output file is "log.log".
                             Set the <path> option to modify log file
                             location and/or name.
                             If the parent folder of <path> does not
                             yet exist, nrfjprog will attempt to create it.
                             Logger output is always appended
                             to the file.
                             Must be combined with another command.