https://devzone.nordicsemi.com/f/nordic-q-a/45083/ble-buttonless-dfuHi, I am using Mac OS and 15.2.0 SDK on nRF52832. I was trying to do BLE DFU following this link . When I was trying to push the DFU zip file, It was resulting in the following error. Initially, as mentioned in the Documentation, I programmed theen-USTelligent Community 13Wed, 20 Mar 2019 16:02:15 GMThttps://devzone.nordicsemi.com/thread/177429?ContentTypeID=1Wed, 20 Mar 2019 16:02:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:24861934-8e64-4ba0-b106-9caac1cc6260Hung Bui<p>Hi Aryan,</p> <p></p> <p>Please verify that you can do normal DFU before you test with buttonless DFU.&nbsp;</p> <p>I have a step by step DFU testing guide <a href="https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader#_cptype=root">here </a>that you may want to follow.&nbsp;</p><div style="clear:both;"></div>