https://devzone.nordicsemi.com/f/nordic-q-a/19020/nrfjprog-readback-protection-problem-on-nrf52-chip-revision-1In general, I&#39;m working on my own dfu-bootloader project which was developped on the &quot;Engineering A&quot; chip-revision of the nRF52832. We finally have new hardware with the chip-revision 1 and I now have the following problem: Flashing the SD with nrfjprogen-USTelligent Community 13Wed, 18 Jan 2017 09:52:06 GMThttps://devzone.nordicsemi.com/thread/73534?ContentTypeID=1Wed, 18 Jan 2017 09:52:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2e61fd98-496b-4ec7-8a10-d5e7f2518e25VanNuru<p>Yes, that was the problem! Thank you! Unfortunately, closing and reopening the RTT Client everytime I want to erase the chip is more annoying than using J-Flash ^^, but at least I know that there isn&#39;t a real problem with my procedure or software.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/73533?ContentTypeID=1Wed, 18 Jan 2017 09:36:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:431e5595-a3a6-44a0-aadf-15de70e292dfbjorn-spockeli<p>I&#39;ve seen this error when I&#39;ve had Segger RTT Client or RTT Viewer running while im using nrfjprog. Are you using RTT in your project?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/73532?ContentTypeID=1Wed, 18 Jan 2017 09:15:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc0bd76b-b6e6-4fd6-88ee-f0d8496ec0ccVanNuru<p>It&#39;s 9.2.1. I edited my whole question because I solved one problem, which I falsely thought was connected to the one remaining.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/73531?ContentTypeID=1Wed, 18 Jan 2017 08:33:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:98d94f01-8414-4222-8b51-c17822a79be2bjorn-spockeli<p>Which version of nrfjprog are you using?</p><div style="clear:both;"></div>