https://devzone.nordicsemi.com/f/nordic-q-a/73665/nrfjprog--f-nrf91---readuicr-uicr-hex-on-nrf9160-address-wrong-bugroot@homelinux:~# nrfjprog --version nrfjprog version: 10.12.1 JLinkARM.dll version: 6.88a nrfjprog -f NRF91 --readuicr uicr.hex gedit ./uicr.hex :0200000400FFFB :10800000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF80 :10801000FFFFFFFFC8FFFFFF00000000FEFFFFFFA4en-USTelligent Community 13Wed, 07 Apr 2021 08:15:55 GMThttps://devzone.nordicsemi.com/thread/303385?ContentTypeID=1Wed, 07 Apr 2021 08:15:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:26e9d6d5-bbeb-4995-a25c-2cd90601abd8Charlie<p>Hi Fatalfeel,</p> <p>You can learn the hex file format from&nbsp;<a href="https://en.wikipedia.org/wiki/Intel_HEX">Intel HEX - Wikipedia</a>.</p> <p>For uicr.hex,&nbsp;<span>02000004<span style="background-color:rgba(0, 128, 0, 1);color:rgba(0, 0, 0, 1);">00FF</span>FB <span style="color:rgba(0, 0, 0, 1);">means&nbsp;</span>the&nbsp; base address starts from 0x00FF0000, the second line&nbsp;:10<span style="background-color:rgba(51, 153, 102, 1);color:rgba(0, 0, 0, 1);">8000</span>00 means relative addree is 0x8000.</span></p> <p><span>Best regards,</span></p> <p><span>Charlie</span></p><div style="clear:both;"></div>