https://devzone.nordicsemi.com/f/nordic-q-a/64895/have-i-broken-my-nrf52840Hello, I have purchased this device to use as a BLE sniffer. I have followed this manual to configure the device as a sniffer: https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_BLE_UG_v3.1.pdf In 2.1.3 say: Follow the instructions in Programmingen-USTelligent Community 13Wed, 02 Sep 2020 13:14:21 GMThttps://devzone.nordicsemi.com/thread/267638?ContentTypeID=1Wed, 02 Sep 2020 13:14:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:becaf324-fe11-4bb0-8294-98b1290a8e2eSimonr<p>Hi</p> <p>First of all, the nRF52840 Dongle does not support the nRF Sniffer for BLE. This is stated in the Supported devices in the Introduction of the <a href="https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_BLE_UG_v3.1.pdf">User Guide</a>. You will need an nRF52840 DK or an nRF51 Dongle, which I assume you have mixed up.</p> <p>Next, You have likely just accidentally erased the UICR on the Dongle or erased the production bootloader. Please follow the Recover after an accidental UICR erase section in our <a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial">Dongle Programming tutorial</a> to see if that helps you get back on track.&nbsp;</p> <p>Best regards,</p> <p>Simon</p> <p><strong>Side note</strong>: The nRF52840 Dongle can be used as <a href="https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-802154">a sniffer for 802.15.4</a>, but we don&#39;t have support for the BLE sniffer I&#39;m afraid.</p><div style="clear:both;"></div>