Failed to flash thingy91: Error when fetching device versions:

[Chris]

Hello,

Somehow my thingy91 is no longer working so I decided to flash it from the beginning.

I put it in MCUboot mode ( holding SW4 and turning on the device)

in Programmer v3.0.3 I see the Thing91 and connect to it and then get the following error

Error when fetching device versions: readFwInfo error (Origin: "Error when starting nrfdl_fw_read_info")

Then the Programmer tool doesn't give me the right to write.

How could I fix this issue ?

I have nrf9160 dk that is working OK, and would use it to flash the thingy if needed but I can't find a full guide for that.

Please advice

[Chris]

Okey, lets do it step by step.

From the guide I'm at step 1 ( updating nrf52840) SoC) https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_thingy91_gsg.html#updating-the-firmware-in-the-nrf52840-soc

I plug thingy91 to my computer, press and hold SW4 then turn on the board (SW1)

In Progammer I get  the following logs

23:25:52.661

[nrfdl][error](23:25:52.661) USBLister: failed to send setup packet NORDIC_SEM_VER_REQUEST

23:25:52.661

[nrfdl][info](23:25:52.661) USBLister: failed to send setup packet NORDIC_DFU_INFO_REQUEST

23:25:52.675

[nrfdl][error](23:25:52.675) USBLister: failed to send setup packet NORDIC_SEM_VER_REQUEST

23:25:52.675

[nrfdl][info](23:25:52.675) USBLister: failed to send setup packet NORDIC_DFU_INFO_REQUEST

The only device available then is in this picture

I connect anyway but I got the following logs

23:26:45.724

Using @nordicsemiconductor/nrf-device-lib-js to communicate with target via USB SDFU protocol

23:26:45.756

Error when fetching device versions: readFwInfo error (Origin: "Error when starting nrfdl_fw_read_info")

23:26:45.757

[nrfdl][error](23:26:45.728) NRFDLException(200): no matching trait found

At this stage, it doesn't matter what I load, the write button is disabled.

Is my device just dead ?

[dejans]

Hi,

I have done some testing and could not reproduce your error. 

I would suggest you to use nRF9160-DK to update the Thingy91 as described in updating firmware on nRF52840 using external debug probe and modem firmware on nRF9160 using external debug probe.

Best regards,
Dejan

[Chris]

Hello,

I'm kinda lost in this step.

How can I check which COM port I should use ?

[dejans]

Hi,

In this step you choose the device that will be used as a debug probe which is in your case nRF9160 DK. You should choose nRF9160 DK from the drop-down list.

Best regards,
Dejan