https://devzone.nordicsemi.com/f/nordic-q-a/18765/bl652-firmware-upgrade-by-jlink-edu-failsHi I am trying to upgrade the firmware in a BL652 using a Segger Jlink Edu. The BL652 is powered with 3.3v using a regulator off the JLink 5v output. I had poor/unreliable firmware upgrade success by FTDI/USB/uart. I have had one module upgradeen-USTelligent Community 13Thu, 05 Jan 2017 09:22:03 GMThttps://devzone.nordicsemi.com/thread/72471?ContentTypeID=1Thu, 05 Jan 2017 09:22:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8b511bb1-20bb-4bb6-a364-ca782c9adc54bjorn-spockeli<p>Glad to hear that you found the cause of the issue :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/72470?ContentTypeID=1Thu, 05 Jan 2017 07:43:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:db2bb81d-3322-40eb-bee4-9750e999f0c3gordy<p>A little bit of embarrassment here.</p> <p>Because it takes considerable force to plug my BL652 adapter into the cheap breadboard I have I did not notice that I had bent a pin.</p> <p>With the pin fixed I have now successfully upgraded the firmware in my BL652 modules using the JLink.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/72469?ContentTypeID=1Thu, 05 Jan 2017 00:04:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9aa01b8b-79c3-4eb5-b7b3-8034f4676ddcgordy<p>This morning I checked my hardware.</p> <p>I found that I had wired a connector adapter from the JLink to my BL652 adapter as a JTag configuration.</p> <p>Rewired my connector adapter as SWD and I had some success.</p> <p>I was able to upgrade the FW of one of my BL652 modules from 28.6.1.2 to 28.6.1.4.</p> <p>However the BL652 module that suffered a UART FW upgrade failure did not recover using the JLink. I can only guess that the boot loader has been corrupted in some way.</p> <p>Attached is the JLink log file.<a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/log-20170105.pdf">log 20170105.pdf</a></p><div style="clear:both;"></div>