Unable to update thingy91

[TilakL]

Dear Nordic,

I am trying to update the Thingy91 by following these steps developer.nordicsemi.com/.../thingy91_gsg.html

At step 12, the "Write" option is greyed out as shown in the picture. Any idea why?

I have PCA20035 v1.0.0 and my end goal is to run the latest modem with the latest Asset Tracker V2 to study the LTE-M coverage/performance in my area with Nordic chipset.

Some history:
1) Earlier I had an old modem: mfw_nrf9160_1.3.1 with Asset Tracker v1.7.0 with all the sensors enabled without the GPS. Works flawlessly.
2) Updated to the latest modem: Tried FOTA using nrfcloud.com but it was cancelled, I am not sure why. So, I tried to update via USB cable by pressing SW4 and power switch and I was able flash mfw_nrf9160_1.3.4.zip successfully.
3) Now my thingy91 LED does not glow, nor the LTE link monitor works.
4) So tried the procedure from the beginning and I am stuck at Step 12, where the "write" option is greyed out developer.nordicsemi.com/.../thingy91_gsg.html

Kindly help.

Thanks,
Tilak

[dejans]

Hi,

It is recommended to update your application firmware to asset tracker v2. Additionally, you could try the procedure described in the guide without using nRF Cloud.

Best regards,
Dejan

[TilakL]

Dear Dejan,

I have tried with the USB cable but it does not seem to work with the latest nRF Programmer tool as the "write" option is greyed out. Is this a bug with the nRF programmer v3.0.7 or is this a known problem with Thingy91 v1.0.0 hardware?

Kindly help.

Thanks,
Tilak

[dejans]

Hi,

I have tested updating procedure using nRF Programmer application v3.0.7 and Thingy91 PCA20035 v1.6.0. I could not reproduce the problem. You could try using some other version of Thingy91, preferably a newer one (v1.5.0 or 1.6.0) if you have it available.

Best regards,
Dejan

[TilakL]

Thank you Dejan,

Unfortunately, I do not have access to the latest hardware.Interestingly, I tried with the latest Debian laptop, the "write" option shows up but the /dev/ttyACM0 needs chmod u+x everytime. But then the MCUBoot does not respond even though the transport is up. The UI does not show the MCUBoot but only shows the version 0.0.1.

Next steps, I am thinking of going back to the old version of the tools that I had used (back when it worked). Otherwise, I am thinking of using the jlink debugger to get the MCUBoot back to life.

In the meanwhile, if you have any pointers on how to recover the thingy91 that would be great.

Thanks,
Tilak

[dejans]

Hi,

Have you followed all 3 recommended steps outlined in programming section for Thingy91?
What is the result?

Best regards,
Dejan