The nRF Util requires a current
version of the board controller firmware to be programmed on the nRF52840
System on Chip (SoC) of the Nordic Thingy:91™.
Download the latest firmware from Nordic Thingy:91 Downloads (select
Precompiled application and modem
firmware).
The archive contains images for different applications in
different formats. Choose an image based on the method you use to update the
firmware: