pynrfjprog fails to program nRF9161

[JyriLehtinen]

We're using a python script to program the modem firmware, create keys and sign the certificates, program application image and some device management yaddayadda. We recently received nRF9161-DK's and I discovered that the pynrfprog package fails to program the modem firmware or application image.

I assume it's because the library lacks the definitions for nRF9161 chips, and it identifies it correctly (nrfprog works normally)

I opened an issue in Github, not sure if opening a ticket here is required (It's not recommended in the Github readme, unlike with many other Nordic repos).

[Didrik Rokhaug]

Hi,

Can you try to recover the nRF9161?

Best regards,

Didrik

[JyriLehtinen]

I can program the board with the Programmer app and VS Code extension just fine, no problems there. It's just the pynrfprog that doesn't work. I don't need to recover the board or do any tricks after it fails.

[Didrik Rokhaug]

I had another look at your function in the issue. Could you try to change the coprocessor from CP_MODEM to CP_APPLICATION?

The debug port on the modem core is locked. So you are technically writing to the application core, and doing a DFU of the modem core from there.

[JyriLehtinen]

Alright, that seemed to do the trick. Why is this different to nRF9160, where I'm programming with CP_MODEM, and can I use CP_APPLICATION to update the modem FW on both nRF9161 and nRF9160?

[Didrik Rokhaug]

I don't know why it worked with the nRF9160.

But yes, it will work with CP_APPLICATION on the nRF9160 as well.