https://devzone.nordicsemi.com/f/nordic-q-a/126083/trouble-writing-to-external-nand-flash-using-nrfutilWe have a custom nRF5340 board that interfaces with an MT29 NAND Flash IC over the SPIM3 peripheral. Our DFU solution involves storing update and rollback images on this external flash. As part of our DFU test suite we have some setup fixtures that useen-USTelligent Community 13Thu, 11 Dec 2025 01:39:50 GMThttps://devzone.nordicsemi.com/thread/556747?ContentTypeID=1Thu, 11 Dec 2025 01:39:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fbd2d1cd-709b-4d9d-b8b0-99270807e0c8brjohnson<p>Coming back with a silly update,</p> <p></p> <p>We have support for two external flash chips, one is NOR and one is NAND. I was mistaken and thought we were using NAND for DFU images, but we are actually using the NOR chip and so my external memory config was totally wrong. After a bit more trouble shooting I was able to access the external NOR flash through nrfutil as we were used to with nrfjprog.&nbsp;</p><div style="clear:both;"></div>