https://devzone.nordicsemi.com/f/nordic-q-a/22289/i-clicked-fill-with-zero-in-jflash-bricked-the-chipHi, By mistake, I clicked &#39;fill with zero&#39; button in Jflash, may I ask, is my chip bricked because of this? Thanks. The following lists my steps: program the softdevice 4.0.2 in jflash compile heart sample project in keil and loaden-USTelligent Community 13Tue, 30 May 2017 05:04:11 GMThttps://devzone.nordicsemi.com/thread/87638?ContentTypeID=1Tue, 30 May 2017 05:04:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ee29c3f-6895-424c-9e6a-d62529ce193dnine-fox<p>Well, it looks like a UICR issue. Since I flashed the DFU example, the UICR is not zero I guess.</p> <p>By trying several times, this issue is resolved by:</p> <p>C:\Users\vincent&gt;nrfjprog --recover -f NRF52 Recovering device. This operation might take 30s. Erasing user code and UICR flash areas.</p> <p>I am not sure why SWD can not connect to my chip if UICR is not cleaned....</p> <p>DFU sample still does not work - I will try again later</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/87637?ContentTypeID=1Wed, 24 May 2017 02:47:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f7ef79ac-00ae-4c90-bb54-4207acb5c355nine-fox<p>Hi @RK thanks for your reply.</p> <p>Looks like a solder issue I guess. I will re-solder and try again.</p> <p>Thank you so much</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/87636?ContentTypeID=1Wed, 24 May 2017 01:04:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b8e8ad9f-a974-42c2-bb73-3b3984306e22RK<p>no it shouldn&#39;t matter at all - you&#39;ve just filled the flash with zeros - jlink should still connect to the board.</p><div style="clear:both;"></div>