How to restore nrf9160 DK's LTE modem firmware?

[Aleksei Vegner]

Hi there!

It seems like I've accidentally destroyed LTE modem firmware in my nrf9160 DK during some experiments.

DFU update utility just can't flash the latest firmware.

Here is my log:

<nickname>@<hostname>:~/Work/nrf91/modem-fw$ nrf9160_mdm_dfu --update
Configure APP IPC as non-secure
Configure IPC HW for DFU
Configure APP RAM as non-secure
Store DFU indication into shared memory
Power up / reset modem
Start polling IPC.MODEM_CTRL_EVENT to receive root key digest
Modem responded with a5000001
Modem root key digest received: 72b3d7c13e549acf08bbc48cb936b9b861e4cbae28a7537c9859a6d945ee9489
Store IPC DFU executable into shared memory
Send IPC.APP_CTRL_TASK
Start polling IPC.MODEM_CTRL_EVENT To receive 'Started' indication from DFU executable
ERROR: Time out, no event received after 10 sec.

Any piece of advice?

[Martin Lesund]

Hi Alex,

This is most likely because you may have erased the secure_boot application from the nrf91

If you flash the secure_boot application the nRF91, you should be able to do a DFU on the modem.

Best Regards,

Martin L.