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Thingy:91 MCU recovery mode doesn't connect to nRF91 chip

Vladimir Velinov

Hi,

recently I got Thingy:91 (board info - PCA20035 1.4.0 2020.22),I've updated it to the latest firmware as per instructions. So far so good. Then I started playing around with some of the nRF connect samples as I wanted to get some experience how bluetooth and GPS works. Unfortunately I couldn't find suitable BT sample that would advertise and show up on my phone as device that I can pair with.

Anyways, I'm using USB and nRF programmer to get all samples flashed. While trying different samples at some point the nRF91 stopped showing up as UART device. I have no problems with nRF52 (SW4 + power ON), but SW3 + power ON does nothing :( Unfortunatelly I have only J-Link LITE that supports only nRF52 architecture, so I can't use it to program the nRF92 chip.

Any ideas what I can do here?

much appreciated,

Vladimir

  • +1

    Hello Vladimir, 

    The nRF52840 found on the Thingy:91 is the device controlling the USB connection to your computer. To restore original function please program the nRF52840 with the Connectivity Bridge application from our latest Precompiled application and modem firmware package in the Downloads tab. You will find the correct .hex fil in the img_app_bl folder

    img_app_bl/
  - Full application images including bootloader.
  - These files can be used with:
    - nRF Connect Programmer (only with SEGGER J-Link or another debug probe)
    - nrfjprog CLI

    More information can be found under the Working with nRF91 series

    Kind regards,
    Øyvind

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