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  • Case ID: 352615
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case about nRF9151 serial_lte_modem and mfw-pti_nrf91x1_2.3.8.zip

peter.min

Hi,

1.Please troubleshoot the issue and identify the cause for no response when sending AT%HWVERSION using the merged_serial_lte_modem_v3.0.0.hex and mfw-pti_nrf91x1_2.3.8.zip firmware on the nRF9151.

2.After flashing the nRF9151 with the firmware merged_at_client_v3.0.0.hex and mfw-pti_nrf91x1_2.3.8.zip, sending the command AT%HWVERSION yields the following response:
> AT%HWVERSION
%HWVERSION: nRF9151 LACA A0A
OK

3.After flashing the nRF9151 with the firmware files merged_serial_lte_modem_v3.0.0.hex and mfw-pti_nrf91x1_2.3.8.zip and sending the command AT%HWVERSION, there was no response as shown below:
> AT%HWVERSION
>

Kind Regards,

Peter.Min

Parents Reply
  • 0 in reply to peter.min

    Hi, and thanks for updating the ticket in English. 

    identify the cause for no response when sending AT%HWVERSION using the merged_serial_lte_modem_v3.0.0.hex and mfw-pti_nrf91x1_2.3.8.zip firmware

    This is very strange behavior that you are observing. I tried to reproduce on my side, but without luck:

    > AT%HWVERSION

%HWVERSION: nRF9151 LACA ADA

OK
> AT+CGMM

nRF9151-LACA

OK
> AT+CGMR

mfw_nrf91x1_2.0.2

OK
Ready
> AT+CGMR

mfw-pti_nrf91x1_2.3.8

OK
> AT%HWVERSION

%HWVERSION: nRF9151 LACA ADA

OK

    Here I tested with nrf9151dk_mfw-2.0.2_sdk-3.1.0/img_app_bl/nrf9151dk_serial_lte_modem_2025-08-14_6c6e5b32.hex (pre-compiled FW package for the nRF9151DK) and the PTI image downloaded from our webpage.

    Kind regards,
    Øyvind

Children
  • 0 in reply to Øyvind

    Peter, I did a new test with a fresh DK, i.e. nRF9151DK v1.0,0 (previous was v0.7.0). Out of the box I got the same behavior with the preinstalled FW

    > at

OK
> AT+CGMR

mfw_nrf91x1_2.0.2

OK
> AT%HWVERSION

%HWVERSION: nRF9151 LACA A0A

OK
Ready
> AT+CGMR
> AT%HWVERSION
Ready
> AT+CGMR

mfw-pti_nrf91x1_2.3.8

OK
> AT%HWVERSION

%HWVERSION: nRF9151 LACA A0A

OK

    On line 14 I programmed the PTI image which yielded the same behavior. Then on line 17 I reprogrammed nrf9151dk_serial_lte_modem_2025-08-14_6c6e5b32.hex which gave correct results. 

    After flashing the nRF9151 with the firmware files merged_serial_lte_modem_v3.0.0.hex and mfw-pti_nrf91x1_2.3.8.zip

    What image did you use on your side?

    Kind regards,
    Øyvind

  • 0 in reply to Øyvind

    Hi Øyvind,

    1.The merged_serial_lte_modem_v3.0.0.hex and mfw-pti_nrf91x1_2.3.8.zip cannot be used together. The merged_serial_lte_modem_v3.0.0.hex is the default firmware compiled for the serial_lte_modem example in ncs v3.0.0.


    2.The files "merged_serial_lte_modem_v3.1.0.hex" and "mfw-pti_nrf91x1_2.3.8.zip" can be used together. "merged_serial_lte_modem_v3.1.0.hex" is the default firmware compiled for the serial_lte_modem example in ncs v3.1.0.


    3.Could you please provide the changes in ncs V3.0.0 and ncs v3.1.0 that are compatible with mfw-pti_nrf91x1_2.3.8.zip?

    Kind Regads,

    Peter.Min

  • +1 in reply to peter.min

    Hi Peter, 

    peter.min said:
    Could you please provide the changes in ncs V3.0.0 and ncs v3.1.0 that are compatible with mfw-pti_nrf91x1_2.3.8.zip?

    I have discussed the issue with our Serial LTE Modem developers and the reason for why it does not work is that it hangs due to nRF Cloud JWT generation failure, the certificates are not properly provisioned. This was changed in NCS v3.1.0 to prevent application to hang. 

    That said, the Serial LTE Modem is not designed to be used with the PTI modem FW. Our developers encourages you to use the AT Client sample instead. SLM wraps lot of functionality (TCP clients, polls etc.) that is good to have in product development, i.e. testing the modem functionality, but not in production testing with the PTI image. As SLM is not designed for that use, they cannot guarantee other bugs will not arise if using SLM from SDK v3.1.0

    Hope this provides an answer to your issue.

    Kind regards,
    Øyvind

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