https://devzone.nordicsemi.com/f/nordic-q-a/18369/nrfjprog-programming-custom-flash-regionsLets assume i have 3 hex files: softdevice.hex (addresses 0x0 to 0x1f000) mySoft1.hex (addresses 0x1f000 to (0x1f000 + size of my program) and 0x7ff00 to 0x7ff80) mySoft2.hex (addresses from 0x7ff80 to 0x80000) I woulden-USTelligent Community 13Tue, 13 Dec 2016 12:50:26 GMThttps://devzone.nordicsemi.com/thread/70911?ContentTypeID=1Tue, 13 Dec 2016 12:50:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a0bd2b4-5bb5-4c63-8043-3bdcb5bdb138Sigurd<p>Hi,</p> <p>You can use <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.tools/dita/tools/nrf5x_command_line_tools/nrf5x_mergehex.html?cp=5_0_2">mergehex</a> for this. With mergehex you can merge up to three hex files into a single hex file.</p> <p>With this command:</p> <pre><code>mergehex -m file1.hex file2.hex file3.hex -o output_file.hex </code></pre> <p>the file1.hex, file2.hex and file3.hex will be merged into the output_file.hex</p><div style="clear:both;"></div>