https://devzone.nordicsemi.com/f/nordic-q-a/89525/nrf52833-mcuboot-single-slot-using-uart-from-esp32Hi, We have a board with ESP32 and nRF52833, connected via UART. We want to upgrade the nRF firmware via either BLE or UART. The nRF image size is large so dual image slots is not possible. I tried CONFIG_SINGLE_APPLICATION_SLOT and CONFIG_MCUMGR_SMP_BTen-USTelligent Community 13Fri, 01 Jul 2022 14:50:50 GMThttps://devzone.nordicsemi.com/thread/375141?ContentTypeID=1Fri, 01 Jul 2022 14:50:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c99f0d28-6bd5-4b30-8970-1e595b5d56bcJONATHAN LL<p><span>Hi, We have entered the summer holiday period in Norway so staffing is low, so some delayed response time is expected.&nbsp;<br /><br /><br /></span></p> [quote user=""]but looks like&nbsp;CONFIG_MCUMGR_CMD_IMG_MGMT requires a second slot.[/quote] <p><span>Yes this is true.</span><br /><br />Adding some links that can be use full:<br />&nbsp;<a href="https://jimmywongiot.com/2021/05/26/overview-on-mcuboot-zephyr-rtos/">Overview on MCUBoot @ Zephyr RTOS – JimmyIoT (jimmywongiot.com)</a>&nbsp;<br /><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/app_bootloaders.html">Bootloaders and Device Firmware Updates — nRF Connect SDK 2.0.99 documentation (nordicsemi.com)</a>&nbsp;<br /><a href="https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/device-firmware-update-dfu-with-mcuboot-bootloader">devzone.nordicsemi.com/.../device-firmware-update-dfu-with-mcuboot-bootloader</a> <br /><br />Here is&nbsp; Blog:&nbsp;<a href="https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/device-firmware-update-dfu-with-mcuboot-bootloader">(+) Device Firmware Update (DFU) with MCUBoot bootloader - Software - nRF Connect SDK guides - Nordic DevZone (nordicsemi.com)</a>&nbsp;<br />And her <a href="https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/ncs-dfu">devzone.nordicsemi.com/.../ncs-dfu</a> <br /><br /><span>Regards,</span><br /><span>Jonathan</span></p><div style="clear:both;"></div>