Unable to write IMEI using %IMEIWRITE to nrf9161

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

marsal — Tue, 15 Oct 2024 18:57:38 GMT

Oh, er, yes, it works indeed... Thank you very much!

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

Øyvind — Tue, 15 Oct 2024 13:17:23 GMT

Hello,

Please note the different modem FW you are working with. The AT%IMEIWRITE command is only available in production test image mfw-pti_nrf91x1_2.3.3.

While CEREG is only available in standard modem FW.

Kind regards,
Øyvind

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

marsal — Tue, 15 Oct 2024 11:22:41 GMT

Hi,

thank you for the good description. I have the following issue:

After flashing mfw-pti_nrf91x1_2.3.3.zip and at_client I am observing the response OK only when a plain AT command is launched, but when any other command is launched, i observe error:

*** Booting nRF Connect SDK v3.5.99-ncs1-2 ***
The AT host sample started
Ready
> AT
OK
> AT+CEREG?
ERROR
> AT AT+CEREG?
ERROR
> AT%XOPERID
ERROR

When I flash mfw_nrf91x1_2.0.1,the response after e.g. AT+CEREG? is correct but yes, I cannot do AT%IMEIWRITE

Any help please?

Thank you very much

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

rajeev — Mon, 29 Jul 2024 19:36:22 GMT

Henrico Brom , I am glad to hear this and that the chain of commands also worked as expected for you.

Cheers

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

Henrico Brom — Fri, 26 Jul 2024 09:40:05 GMT

Hi Rajeev,
Updating the modem firmware to the PTI image did indeed the trick for me.
Thank you for elaborate answer.

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

rajeev — Tue, 23 Jul 2024 19:35:09 GMT

This is the solution/steps that have worked for me reliably and consistently for programming the IMEI to over 100 nRF9161 SiPs...

Make sure you have requested or obtained the IMEI numbers from the nRF Cloud console under IMEI Management.

Flash latest Production Test Image (PTI) (mfw-pti_nrf91x1_2.3.3.zip) to the modem. This PTI modem firmware has the support for IMEI write but not nRF91x1 SiP LTE firmware.
Build and flash at_client app to the nRF9161. The AT_CMD will easily allow you to write the IMEI number
To Write, issue command: AT%IMEIWRITE=0,”IMEI NUMBER”
It should return/reply with :
%IMEIWRITE: 358299840099762
OK
This means your write was successful and it has read what you expected to write/wrote
If not, then you have an issue or something is not configured properly. Check that your UART read/write is functioning as expected.
If all goes well and IMEI is successfully written, update the modem firmware with
nRF91x1 SiP LTE firmware (mfw_nrf91x1_2.0.1)
Build and flash at_client app again to test the connectivity and modem functionality

Note there is a difference between Production Test Image (PTI) and nRF91x1 SiP LTE firmware for the modem.

Hope this helps.

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

Henrico Brom — Tue, 23 Jul 2024 14:44:01 GMT

Did you find a solution?

I am running into the same issue were I am trying to program the IMEI on a custom nRF9161 board using RTT and the 'at AT%IMEIWRITE=0,"<imei>"; command but also getting the ERROR response. I tried escaping the " characters with a backslash as suggested in the modem shell AT command documentation but with not luck.

mosh:~$ Modem domain event: No IMEI
Network registration status: searching
Currently active system mode: LTE-M
LTE cell changed: ID: 17031947, Tracking area: 33902
at AT+CGMR
mfw_nrf91x1_2.0.1

OK

mosh:~$ at AT%IMEIWRITE=0,\"<imei>\"
ERROR

Kind regards,
Henrico

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

Øyvind — Tue, 18 Jun 2024 12:30:18 GMT

Hey Sam,

I missed an important detail in your case, you are using MoSH. Please see notes here:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/cellular/modem_shell/README.html#at_commands

Let me know how that works for you!

Kind regards,
Øyvind

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

SCollins — Fri, 14 Jun 2024 09:47:00 GMT

This is a custom board based on a feather but updated for the nrf9161. Every attempt to write the IMEI has failed with an error. The docs suggests that the ERROR is because of a syntax error but from what I can tell the syntax I am using above is correct.

Thanks,

Sam

RE: Unable to write IMEI using %IMEIWRITE to nrf9161

Øyvind — Fri, 14 Jun 2024 07:23:58 GMT

Hello Sam,

Is this a new device on the custom board, or are you testing on a development kit?

Please note, as stated in the Write IMEI %IMEIWRITE documentation

The command is a one-time operation. The IMEI value cannot be rewritten. The device can become unusable if the wrong IMEI is written.

The command responds with OK and the device's IMEI value if the command syntax is correct. Syntax error returns Error.

Kind regards,
Øyvind