https://devzone.nordicsemi.com/f/nordic-q-a/112023/questions-about-mcuboot-secondary-image-slot-on-sdhc-cardI&#39;ve been searching threads on this topic on DevZone and I found a couple that concluded that MCUBoot can work with external SPI flashes, but not with an SD card. Is that still the case? I can currently fit two images in my processor, but I donen-USTelligent Community 13Wed, 12 Jun 2024 14:24:33 GMThttps://devzone.nordicsemi.com/thread/488535?ContentTypeID=1Wed, 12 Jun 2024 14:24:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a43cbf7a-4460-45d7-ac1b-7d8efb3ca97fMenon<p>Hello,</p> [quote user=""]I&#39;ve been searching threads on this topic on DevZone and I found a couple that concluded that MCUBoot can work with external SPI flashes, but not with an SD card.[/quote] <p>MCUboot won&#39;t support booting from an SD card, and I think this is because MCUboot expects a firmware image inside the flash memory, or, I would say, MCUboot is not designed to fetch and execute the firmware image from an SD card. See the <a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/mcuboot/design.html#limitations">limitation</a>&nbsp;inside the bootloader section.</p> <p>Kind Regards,</p> <p>Abhijith</p> <p></p><div style="clear:both;"></div>