User's Guide

Firmware update
6. Click Select device and select the appropriate debug probe entry from the drop-down list in the nRF
Connect Programmer.
7. Click Update Modem in the Cellular Modem pane on the right and choose the zip file with the latest
modem release.
8. Click Write in the Device pane on the right and wait for the update to complete.
Note: If you have issues updating modem firmware, then do Erase All before trying to update
the modem again.
5.2 Updating application firmware
Application firmware update on a Nordic Thingy:91 can be done either on the main nRF9160 SiP
component or on the nRF52840 SoC component.
The selection of the target to be updated is based on the switch and the buttons in Nordic Thingy:91
which form part of its hardware technology.
5.2.1 Updating application firmware on nRF9160
Application firmware update on the nRF9160 SiP in Nordic Thingy:91 can be done in multiple ways.
• Using USB (MCUboot)
• Using an external debug probe
5.2.1.1 Updating application firmware on nRF9160 using USB (MCUboot)
Firmware updates can be done directly on the nRF9160 SiP of Nordic Thingy:91 by putting the device into
serial recovery mode.
To update the application firmware on nRF9160 using USB (MCUboot) and the built-in serial recovery
mode, complete the steps in this section.
1. Connect Nordic Thingy:91 to the PC using USB.
2. Put the Nordic Thingy:91 into application serial recovery mode by pushing the SW3 button while
powering on.
3. Start nRF Connect Programmer.
4. Click Select device and select the appropriate device entry from the drop-down list in the nRF Connect
Programmer as shown in the following figure.
4418_1336 v1.2
16