https://devzone.nordicsemi.com/f/nordic-q-a/75696/nrf52840-error-failed-to-initialize-sniffer-prop_value_set-tid-1-mac_filter_modeHi, I have flashed the nRF52840 dongle on macos (11.4) and ubuntu (20.04.20) using nRF Connect for Desktop (3.61) following the guide ( https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_sniffer_ble%2FUG%2Fsniffer_ble%2Fintro.html ). Using pyspinelen-USTelligent Community 13Fri, 28 May 2021 14:42:19 GMThttps://devzone.nordicsemi.com/thread/312427?ContentTypeID=1Fri, 28 May 2021 14:42:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c3bf4cae-2bbe-4b28-ada8-e1f8830aaa5bCharlie<p>Hi nmonkee,</p> <p>I repeat this process, everything seems fine. Here is my setup:</p> <h2>1. Build latest NCP for nRF52840 dongle(v1.2.0).</h2> <p>Setup build envrionment following&nbsp;<a href="https://github.com/openthread/ot-nrf528xx/blob/main/src/nrf52840/README.md">ot-nrf528xx/README.md at main · openthread/ot-nrf528xx (github.com)</a>&nbsp;and build with following commands:</p> <p><pre class="ui-code" data-mode="text">/script/build nrf52840 USB_trans -DOT_BOOTLOADER=USB arm-none-eabi-objcopy -O ihex build/bin/ot-ncp-ftd ot-ncp-ftd.hex</pre></p> <p>I get the hex file:&nbsp;<a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/1004.ot_2D00_ncp_2D00_ftd.hex">devzone.nordicsemi.com/.../1004.ot_2D00_ncp_2D00_ftd.hex</a></p> <h2>2. Programming&nbsp;<a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nc_programmer%2FUG%2Fnrf_connect_programmer%2Fncp_programming_dongle.html">nRF52840 Dongle</a>&nbsp;through USB bootloader.</h2> <h2>3. Run the sniffer.py</h2> <p>I am not sure if you tested with the same NCP firmware. Please test my hex file and also check your nRF52840 version. The document mentioned that it only tested PCA10059 1.0.0.</p> <p>Best regards,</p> <p>Charlie</p> <p></p> <p>&nbsp;</p><div style="clear:both;"></div>