https://devzone.nordicsemi.com/f/nordic-q-a/24847/why-the-nrfgo-studio-failed-to-program-hex-file-while-the-lock-entire-chip-from-readback-has-been-checkedHi all, I programed hex file (blinky example) to nRF51DK via nRFgo Studio, and the board could work fine (keep blinky). However, the nRF51DK will work FAIL (LEDs are not blinky) while the &quot;Lock entire chip from readback&quot; has been checked even thoughen-USTelligent Community 13Mon, 04 Sep 2017 12:00:28 GMThttps://devzone.nordicsemi.com/thread/97859?ContentTypeID=1Mon, 04 Sep 2017 12:00:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f8e94aae-880e-4bd8-91e7-4acfefb7a829stephen<p>--recover option works. Thank you!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/97858?ContentTypeID=1Fri, 01 Sep 2017 15:42:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a22e477e-3e05-4e73-9ff5-9453d7bf7e05Cps53<p>Have a look at this thread <a href="https://devzone.nordicsemi.com/question/32585/how-to-enable-readback-protection/">devzone.nordicsemi.com/.../</a></p> <p>I think you will need to use the nrfjprog program in the command line tools to reprogram the board after this is set. You will need the --recover option. I&#39;m not sure if nrfgo studio will do this.</p> <p><a href="https://www.nordicsemi.com/eng/nordic/Products/nRF51822/nRF5x-Command-Line-Tools-Win32/33444">www.nordicsemi.com/.../33444</a></p><div style="clear:both;"></div>