Just got my Thing 91 and wanted to update the application firmware on the SiP using nRF connect 3.3 .0 programmer but when connecting to the device I got the following error:
ERROR Error while probing devices: Error occured when get serial numbers. Errorcode: CouldNotCallFunction (0x9)
Then I tried with nRF connect 3.2.0 (uninstalled all nrf/jlink tools) and I was able to connect to the device and luanch a write sequence but it halted on 0%.
now I'm back to nRF connect 3.3.0 and it says device closed when trying to connect it says device closed and I can't do much to load firmware or anything !
When resetting Thingy 91 to normal mode I can see the logs in LTE link monitor.
How can I fix this ? I don't have any jlink to flash it directly,
If you are trying to flash an application .hex to the Thingy:91 without an external debugger, you can set the device in "serial recovery mode" and then try to flash the application.
To update the modem firmware you would need an external jlink or a nRF91DK.
Now it's working. thank you