https://devzone.nordicsemi.com/f/nordic-q-a/63212/trouble-with-bt840-and-nrf5-sdk-ble_app_uart-exampleHi, I&#39;m quite new to the nRF environment and am trying to run one of the nRF5 SDK examples (ble_peripheral -&gt; ble_app_uart -&gt; pca10056 -&gt; s140) on a custom bord with BT840 (nrf52840). Instead of being initialized properly, the device is shown in theen-USTelligent Community 13Wed, 01 Jul 2020 08:23:57 GMThttps://devzone.nordicsemi.com/thread/257737?ContentTypeID=1Wed, 01 Jul 2020 08:23:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e88dedd2-44df-4f46-b1f5-976c50cfdb1eEivinhj<p>Thank you for the quick reply!</p> <p>I&nbsp;generated a bootloader with &quot;<em>nrfutil settings generate --family NRF52840 --application ble_app_uart_pca10056_s140.hex&nbsp; --application-version 3 --bootloader-version 2 --bl-settings-version 2 settings.hex&quot;</em> and flashed it. It works!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/257669?ContentTypeID=1Tue, 30 Jun 2020 20:08:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8aecb0c9-9c94-4fb7-9d60-cd27097b11eaTurbo J[quote userid="91593" url="~/f/nordic-q-a/63212/trouble-with-bt840-and-nrf5-sdk-ble_app_uart-example"] Instead of being initialized properly, the device is shown in the nRF Connect app as &quot;dfutarg&quot;. [/quote] <p>That is the bootloader.</p> <p>If you want to run/debug an application with a bootloader installed, generate the bootloader settings page with nrfutil and flash it, too.</p> <p>Other workaround: Completely erase the chip including UICR.</p><div style="clear:both;"></div>