Using following Setup:

IDE : VS Code (NRF connect plug-in)

Programmer : Stm32Cube programmer

Stlink Debugger

OS: Zephyr

MCU: Stm32u5 series
Bootloader: mcuboot

When I try to apply delta_update using delta update library interfaces as provided in the link:
https://github.com/saralinnealindh/delta-updates-for-embedded-systems

I followed steps in repo of the provided link, the image patch generated and applied on the board that is Stm32u575 it’s not working and giving the error as shown in below screenshots “invalid image”.
Comparing image with STM32cubeprogrammer shows the image signing trailer part is missing from patch.
Any suggestion will be appreciated on this interface boot_request_upgrade and how to check that signing process of the image is right ?

Here is the last piece of code before booting :

LOG:

Prj.conf :

### Print a banner on the UART on startup.
CONFIG_BOOT_BANNER=y
### MCUBOOT
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_IMG_MANAGER=y
CONFIG_MCUBOOT_IMG_MANAGER=y
CONFIG_IMG_ERASE_PROGRESSIVELY=y

CONFIG_REBOOT=y
CONFIG_MCUBOOT_SIGNATURE_KEY_FILE="D:/dev/zephyrproject/bootloader/mcuboot/root-rsa-2048.pem"
CONFIG_MCUBOOT_IMGTOOL_SIGN_VERSION="0.0.1+0"
CONFIG_MCUBOOT_BOOTLOADER_MODE_SWAP_SCRATCH=y
CONFIG_MCUBOOT_EXTRA_IMGTOOL_ARGS="--pad"


# Enable console and printk()
CONFIG_PRINTK=y
# CONFIG_STDOUT_CONSOLE=y

CONFIG_GPIO=y
# CONFIG_UPDATEABLE_IMAGE_NUMBER=


# Logging
CONFIG_LOG=y
CONFIG_LOG_MODE_IMMEDIATE=y
CONFIG_LOG_PRINTK=y
CONFIG_LOG_DEFAULT_LEVEL=4
CONFIG_SERIAL=y


# Flash
CONFIG_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_STREAM_FLASH=y
CONFIG_STREAM_FLASH_ERASE=y
CONFIG_FLASH_MAP=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y


CONFIG_IMG_BLOCK_BUF_SIZE=2048
CONFIG_HEAP_MEM_POOL_SIZE=6096
CONFIG_MAIN_STACK_SIZE=10240