Nordic Thingy:91 only connecting to USB in MCUBOOT mode

[RikPi]

Hi,

I was trying to flash my Nordic Thingy:91 (1.4.0) for the first time. At some point the device stopped connecting to the computer and now only shows up when turned on in MCUBOOT mode, by keeping SW4 pressed while flicking the power switch on. Additionally, the LEDs do not blink anymore.

I am using Win11 and the nRF Programmer v 3.0.8, the hex I tried to flash is the last version in the downloads section (2023-03-02_8f26142b).

Thank you in advance :)

Riccardo

[Øyvind]

Hello Riccardo, 

What .hex file did you try to program on the Thingy:91? Could you please provide full path? 

keeping SW4 pressed while flicking the power switch on

Please note:

• SW4 - The button used to update the nRF52840 SoC.

• SW3 - The main button used to flash the nRF9160 SiP.

The nRF52840 SoC is what handles the USB connection to the computer. If you have programmed the wrong firmware to the nRF52840, you will not see any connection e.g. logging. More information can be found in the Gettting started with Thingy:91 documentation in our nRF Connect SDK.

In order to fix this, you will need to program thingy91_fw_2023-03-02_8f26142b\img_fota_dfu_hex\thingy91_nrf52_connectivity_bridge_2023-03-02_8f26142b.hex to the nRF52840SoC. 

Kind regards,
Øyvind

[RikPi]

HI Øyvind,

Thank you for your help! Turns out I flashed the wrong hex (don't remember precise path but I guess it was the asset tracker app). Now that I flashed the connectivity bridge and then asset tracker application, the LEDs are flashing again and the USB works

I am just waiting for my new iBasis SIM because the one I got was expired and I will be ready to prototype!

Thank you very much again :)

Best regards,

Riccardo

[Øyvind]

I'm happy we were able to find the answer, Riccardo! Good luck in your testing!

Kind regards,
Øyvind