https://devzone.nordicsemi.com/f/nordic-q-a/4888/swd-communication-failureI&#39;m using the Ulink-ME tool in order to program/debug my custom board based on the nRF51822 device. The problem I have is that sometimes the flashing procedure is working fine but sometimes, when going to &#39;Option for Target...&#39; --&gt; &#39;Debug&#39; --&gt; Settingsen-USTelligent Community 13Tue, 27 Oct 2015 10:50:14 GMThttps://devzone.nordicsemi.com/thread/17261?ContentTypeID=1Tue, 27 Oct 2015 10:50:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:73b1c6d9-e88f-48f8-949e-3cdb6f33f599Muhammad Moiz khan<p>I have the similar problem my Ulink2 device sometimes download the program while sometimes it show&#39;s SWD communication failure error.I have checked the cable and connection&#39;s all are fine, not able to rectify, what is the issue behind it. Any comment regarding this issue will be highly appreciated.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17260?ContentTypeID=1Thu, 22 Jan 2015 15:43:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7e1025ff-b6d8-46da-8581-c921002e20e0Petter Myhre<p>Segger&#39;s tools are the only ones we offically support.</p> <p>That said, you settings looks good, but I haven&#39;t seen that error before.</p> <p>This is just happening sometimes? Could it be a hardware issue? Bad connection somewhere or a bad cable?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17259?ContentTypeID=1Tue, 23 Dec 2014 11:29:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8259799a-9208-4f51-8b7d-234c60292948Dani<p>I have more information related to that: everytime I want to flash a new application I need to first, reset the device, erase it and flash sofdevice. Then I can flash my application. But when I want to flash application again, I need to proceed in the same way.</p><div style="clear:both;"></div>