https://devzone.nordicsemi.com/f/nordic-q-a/62074/howto-recover-a-nrf52840-development-kitMy program loaded to a nRF52840 DK unfortunately adresses ports P1.15 and P1.13. Now the DK is not reachable for Segger IDE and can not be found as a USB device. I can reach the boot mode, but how to erase or change the program on the target?en-USTelligent Community 13Wed, 03 Jun 2020 11:47:20 GMThttps://devzone.nordicsemi.com/thread/252981?ContentTypeID=1Wed, 03 Jun 2020 11:47:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f9dc87d9-1c98-42ef-afd3-4948e81e05dbgood_night<p>Thank you Dmitry,</p> <p>I did like proposed in the linked article - everything is fine again now.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/252846?ContentTypeID=1Tue, 02 Jun 2020 20:21:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6d907e12-6531-4fc5-b641-06cdedda8233Dmitry<p>[quote userid="20994" url="~/f/nordic-q-a/62074/howto-recover-a-nrf52840-development-kit"]Now the DK is not reachable for Segger IDE and can not be found as a USB device. I can reach the boot mode, but how to erase or change the program on the target?[/quote]</p> <p>Did you enter interface MCU into boot mode (by pressing IF BOOT/RESET button)?&nbsp; Look <a href="https://devzone.nordicsemi.com/f/nordic-q-a/29012/nrf52-dk-boot-problem-after-press-if-boot-reset-button">here</a> if it&#39;s your case. P1.15 and P1.13 shouldn&#39;t cause any problems with DK.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/252834?ContentTypeID=1Tue, 02 Jun 2020 18:15:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0be16dec-fe4c-452e-b24d-03b4a565a009good_night<p>Any help is warm welcome for fixing this PCA10056 DK.</p><div style="clear:both;"></div>