https://devzone.nordicsemi.com/f/nordic-q-a/17476/how-do-i-program-flash-blinky_pca10040-to-a-custom-boardI compile blinky_pca10040 I use IAR EWARM - ARM Cortex compiler I have a Rigado BMD-300 on my PCB Use J-LINK EDU When I try to download and debug, I get the error &quot;Failed to get CPU status after 4 retries&quot; Any help appreciateden-USTelligent Community 13Thu, 03 Nov 2016 11:34:51 GMThttps://devzone.nordicsemi.com/thread/67170?ContentTypeID=1Thu, 03 Nov 2016 11:34:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cfbd1b12-3fb8-493b-aba1-00c93017aff7Petter Myhre<p>I haven&#39;t used the BMD-300 module myself, but it seems it comes with read-back protection enabled. See <a href="https://devzone.nordicsemi.com/question/84615/erasing-bmd-300/">this</a> and <a href="https://devzone.nordicsemi.com/question/99069/rigado-bmd-300-with-nrf52-dk/">this</a>. Maybe that is causing the issue? Have you installed the latest <a href="https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832#Downloads">nRF5x toolset</a>? Can you try to use nrfjprog, and see if you get contact with the chip? Have you used IAR and the J-Link EDU with other chips?</p><div style="clear:both;"></div>