i want to enable dfu in this board hplease help me what are the configurations i need to enable when i do
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y
i am getting this on terminal
*** Booting MCUboot v2.1.0-dev-9b4ae4cbc9e2 ***
*** Using nRF Connect SDK v3.1.1-e2a97fe2578a ***
*** Using Zephyr OS v4.1.99-ff8f0c579eeb ***
I: Starting bootloader
I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Image index: 0, Swap type: none
E: Image in the primary slot is not valid!
E: Unable to find bootable image