Thingy91 Firmware Flashing Issues

RE: Thingy91 Firmware Flashing Issues

Menon — Thu, 31 Oct 2024 12:49:09 GMT

Hello,

Which build configuration are you using to build the AT_client sample? I'm not sure about the issue you're facing, but I recommend checking out the Developer Academy course exercise. It provides detailed guidance on AT commands and focuses on the AT_client sample, including the correct build configuration and how to flash the Thingy91 properly.

Please let me know if this helps resolve your issue, or if you're still encountering problems.

Kind regards,
Abhijith

RE: Thingy91 Firmware Flashing Issues

roshan.nepal — Wed, 30 Oct 2024 16:21:28 GMT

Hi,

I am using nRF SDK v2.6.0. It seems like the MCUboot is corrupted. So, as suggested I used an external debugger with the nRF9160 DK, and it successfully flashed and ran the Asset Tracker v2 hex file from mfw1.3.6. I was able to see messages on the nRF Cloud, confirming that it was working correctly.

However, when I tried flashing the at_client from the img_app_bl folder, the Thingy:91 stopped functioning properly. I no longer see any LED activity, and the Cellular Monitor shows the status as "Unknown." Below is the behavior observed when connecting the Thingy:91 directly via USB after flashing the hex file with the debugger.

Additionally, I am getting serial port and SIM-related errors. I have attached the log file for your reference:

devzone.nordicsemi.com/.../2024_2D00_10_2D00_30T16_5F00_10_5F00_56.494Z_2D00_log.txt

Could you please assist me in troubleshooting this issue? Let me know if you need any further information.

Thanks,

Roshan

RE: Thingy91 Firmware Flashing Issues

Menon — Wed, 30 Oct 2024 15:14:52 GMT

Hello,

Could you please tell me which SDK version you are using? What is the current status of the Thingy91 in the nRF Connect Programmer app? Is the Thingy91 entering bootloader mode properly? If so, how is it identified by the Programmer app? Could you share a screenshot from the nRF Connect Programmer app?

The Thingy91 comes with a preloaded default bootloader (MCUBoot). Based on the error messages you shared, it seems the bootloader may be corrupted, causing the device to boot into an invalid state or get stuck in a boot loop. If that’s the case, you will need to use an external debugger to program the Thingy91, See the section Updating the Firmware Through external debug probe .

Kind regards,
Abhijith