RE: nRF9160 GPS functionality broken after factory reset

Stephan Walter — Fri, 06 Feb 2026 08:45:00 GMT

It was indeed the system mode. We have a Frankenstein architecture with the main application (and Zephyr network stack) running on an nRF53, which communicates with the nRF91 over SPI, relaying AT commands and socket operations.

We were missing the code in nrf/lib/lte_link_control/lte_lc_modem_hooks.c

One way to fix this is to insert the following code somewhere on the nRF53:

STRUCT_SECTION_FOREACH(nrf_modem_lib_init_cb, e) {
    e->callback(0, e->context);
}

But we decided to just call lte_lc_system_mode_set() with the desired parameters.

RE: nRF9160 GPS functionality broken after factory reset

Stephan Walter — Fri, 06 Feb 2026 07:51:03 GMT

I suspect that I'm missing the system mode command. We recently updated the nRF SDK and it seems that got lost somehow.