https://devzone.nordicsemi.com/f/nordic-q-a/49571/pca10031-firmware-update-failedHi, I would like to use PCA10031 to be a sniffer. It can&#39;t update and show as below figure. I&#39;ve also refer to discussion as below website to turn it into BOOTLOADER mode and then copy-paste the newly version of J-Link OB-SAM3U128-V2-NordicSemien-USTelligent Community 13Wed, 10 Jul 2019 06:42:14 GMThttps://devzone.nordicsemi.com/thread/197496?ContentTypeID=1Wed, 10 Jul 2019 06:42:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:30c9150b-a75e-447d-ae61-2f2f357e5d22Amanda Hsieh<p>Hi,&nbsp;</p> <p></p> <p>The J-Link OB firmware version seems they are the same,&nbsp;<span>J-Link OB-SAM3U128-V2-NordicSemi. Only the compiled day is different. I think that might be the reason.&nbsp;</span></p> <p>According to the page7 in the&nbsp;<a href="https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_UG_v2.2.pdf">https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_UG_v2.2.pdf</a>:&nbsp;</p> <p><em>Verify that the Sniffer firmware is running correctly by checking that LED1 toggles each time a packet is received. At least one device must be advertising for the Sniffer to detect the advertisements.</em></p> <p><em></em></p> <p>-Amanda H.</p><div style="clear:both;"></div>