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

[Øyvind]

Hello Peter, can you please provide your question in English?

Thank you!

Kind regards,
Øyvind

[peter.min]

Hi Øyvind,

Updated already.

Kind Regards,

Peter.Min

[Øyvind]

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

[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

[peter.min]

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