https://devzone.nordicsemi.com/f/nordic-q-a/111533/ncs-dfu-failHi,nordic teams im develop a keyboard use nrf52840 by ncs sdk 2.6.when i test the dfu funcation by python file ,there is 2 problems . 1.the usb dfu is so slow that i need spend 10 mins can completed. 2.Actually, the upgrade was not successful。 en-USTelligent Community 13Tue, 28 May 2024 03:13:32 GMThttps://devzone.nordicsemi.com/thread/486072?ContentTypeID=1Tue, 28 May 2024 03:13:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1f8a7919-3cc3-4c02-99dd-91f86ef53417pipixia_1_1<p>tks for your replay! it resolve my problem.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/486013?ContentTypeID=1Mon, 27 May 2024 11:43:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e48aea4c-94c7-4c35-b666-027d28bab76eKenneth<p>Hello,</p> <p>Regarding DFU speed - it was intended for background DFU, so speed is not a priority here. We focused on avoiding negative impact on HID input reports.&nbsp;</p> <p>Regarding DFU is not successful - The B0&nbsp;bootloader requires bumping image version for the DFU. Update image with lower or the same version is basically rejected. We would suggest to update CONFIG_FW_INFO_FIRMWARE_VERSION Kconfig option in application configuraton to higher number than used by currently booted image.<br /> <br />For details about B0 bootloader configuration in nRF Desktop, see: <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.6.0/nrf/applications/nrf_desktop/bootloader_dfu.html#configuring-the-b0-bootloader">https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.6.0/nrf/applications/nrf_desktop/bootloader_dfu.html#configuring-the-b0-bootloader</a>&nbsp;</p> <p>Best regards,<br />Kenenth</p><div style="clear:both;"></div>