https://devzone.nordicsemi.com/f/nordic-q-a/34088/adafruit-sniffer-initialization-error-ctrl-rI have the Adafruit Sniffer which is based on the nRF51822 Bluefruit LE Friend, which contains the Raytac MDBT40 . After searching and finding the CP2104 drivers, I can speak to the device but the BLE Sniffer software says I need to use Ctrl-R to re-programen-USTelligent Community 13Mon, 07 May 2018 11:18:51 GMThttps://devzone.nordicsemi.com/thread/131181?ContentTypeID=1Mon, 07 May 2018 11:18:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aca69fc7-e06e-4cfe-a837-8959352db417haakonsh<p>Hey Aeneas,</p> <p>Our sniffers does not support the Adafruit sniffer HW. We use an on-board SEGGER debugger chip on our nRF51 dongle to program the nRF51 with the sniffer FW.&nbsp;<br /><br />I suggest you get your hands on a nRF52832 DK (PCA10040) and use our v2 sniffer&nbsp;<a href="http://infocenter.nordicsemi.com/pdf/nRF_Sniffer_UG_v2.1.pdf" target="_blank" rel="noopener noreferrer">nRF Sniffer User Guide v2.</a>1.&nbsp;</p> <p>Cheers,</p> <p>Håkon.</p><div style="clear:both;"></div>