https://devzone.nordicsemi.com/f/nordic-q-a/94261/how-to-use-the-external-flash-of-nrf9160dkDear Nordic Engineers I have a question would like to ask you. As we all know, NRF9160 DK has a 64MB external flash. Now, I would like to use this external flash to save the FOTA file. But, I can&#39;t use it, so I read the Use Guide of NRF9160 DK,.Iten-USTelligent Community 13Fri, 25 Nov 2022 13:20:51 GMThttps://devzone.nordicsemi.com/thread/397659?ContentTypeID=1Fri, 25 Nov 2022 13:20:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1a35b7a1-f55f-4cfc-8ba5-a830bcd41c81Priyanka<p>Hi Wang,</p> <p>You can refer to the Github Link created by one of my colleagues, which was provided in the earlier comment by <strong>@Jeremy Herbert.</strong>&nbsp;THe nRF52840 SoC on the 9160DK comes pre-programmed with a default firmware and in case this firmware is lost, you can program the hello_world sample onto it and then proceed. B<span>y default, the physical pins connected from ext_flash -&gt; nRF9160 is switched out. In order to&nbsp;use the external flash, the board controller (nRF52) must switch the GPIOs in, which is what the .hex file in the github link does:</span></p> <p><span><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/1512.pastedimage1669382362801v1.png" alt=" " /></span></p> <p><span>Also, you can read more about the <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_nrf9160.html#id9">board controller in the developer page</a>:</span></p> <p><span><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/8468.pastedimage1669382416915v2.png" alt=" " /></span></p> <p><span>Best Regards,</span></p> <p><span>Priyanka</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/397616?ContentTypeID=1Fri, 25 Nov 2022 11:31:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9955d0b3-5b75-4e1e-88e3-ea8ef2370b20jeremyherbert<p>The nrf52 controls the switch.</p> <p>You can&nbsp;load a firmware like the one here:&nbsp;<a id="" href="https://github.com/simon-iversen/sdk-nrf/tree/d1a11f2c39e3b8fb0af7652e7e720626f0e1298e/samples/nrf9160/http_update/application_update">https://github.com/simon-iversen/sdk-nrf/tree/d1a11f2c39e3b8fb0af7652e7e720626f0e1298e/samples/nrf9160/http_update/application_update</a>&nbsp;(see the hex file in this folder) to connect the 64Mbit flash to the nrf91.</p><div style="clear:both;"></div>