https://devzone.nordicsemi.com/f/nordic-q-a/128292/external-flash-related-issueHello Nordic Team, I am currently working with the nRF52832 on a custom board using nRF Connect SDK v2.9.0. I am implementing OTA DFU using Sysbuild and MCUboot with an external Winbond W25Q64 SPI flash device. I have followed the official Nordicen-USTelligent Community 13Mon, 01 Jun 2026 09:24:37 GMThttps://devzone.nordicsemi.com/thread/567183?ContentTypeID=1Mon, 01 Jun 2026 09:24:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f4e5ef91-ef03-47a2-9ac6-6dc158fc1320Simonr<p>Hi</p> <p>The -19 error message points to there being no device connected. Have you set up the SPI device both in the MCUBoot and application .dts and .conf files? Also, how is the SPI device physically connected to the nRF52832 on your design and what pins are used for SCL, SDO and SDI?</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>