https://devzone.nordicsemi.com/f/nordic-q-a/86875/thingy-91-mcu-recovery-mode-doesn-t-connect-to-nrf91-chipHi, recently I got Thingy:91 (board info - PCA20035 1.4.0 2020.22),I&#39;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 howen-USTelligent Community 13Tue, 12 Apr 2022 07:55:08 GMThttps://devzone.nordicsemi.com/thread/362963?ContentTypeID=1Tue, 12 Apr 2022 07:55:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a9bb2499-4bda-458b-861d-7f6b2dec8d28&#216;yvind<p>Hello Vladimir,&nbsp;<br /><br />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&nbsp;application from our latest <a href="https://www.nordicsemi.com/Products/Development-hardware/Nordic-Thingy-91/Download?lang=en#infotabs">Precompiled application and modem firmware package</a>&nbsp;in the Downloads tab. You will find the correct .hex fil in the img_app_bl folder<br /><br /></p> <p><pre class="ui-code" data-mode="text">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</pre></p> <p>More information can be found under the <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrf/ug_nrf91.html#working-with-nrf91-series">Working with nRF91 series</a></p> <p>Kind regards,<br />Øyvind</p><div style="clear:both;"></div>