Invalid Object on nRF51822 during DFU Secure Bootloaderhttps://devzone.nordicsemi.com/f/nordic-q-a/23188/invalid-object-on-nrf51822-during-dfu-secure-bootloaderHello, I am trying to implement DFU secure bootloader to do firmware update over the air for nrf51822. I have followed the steps as per the blog devzone.nordicsemi.com/.../ , created private, public keys and ZIP file for DFU update. en-USTelligent Community 13Tue, 04 Jul 2017 11:24:29 GMTRE: Invalid Object on nRF51822 during DFU Secure Bootloaderhttps://devzone.nordicsemi.com/thread/91199?ContentTypeID=1Tue, 04 Jul 2017 11:24:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5ba7277e-bf53-46ae-81f8-1156ca6a6239Vidar Berg<p>I would suggest to place breakpoints (or use RTT logging) in dfu_req_handling.c-&gt;dfu_handle_prevalidate to check if the pre-validation step is failing (version mismatch, etc).</p><div style="clear:both;"></div>