Error: S_SECURITY_SECURE_USB_DL_IMAGE_SIGN_HEADER_NOT_FOU ND

NCK team Help me to Solve this Problem.

Mediatek Version Release: CUN-L21C429B107
Display ID: CUN-L21C429B107
Model: HUAWEI CUN-L21
Brand: HUAWEI
Build ID: HUAWEICUN-L21
Device: HWCUN-L6735
Version: 5.1


here the Logs!!!

Selected Model: Huawei: Ascend Y5 II[CUN-L21]
Exe version: NCKBox AndroidMTK 1.8.8.1
Scenario: [0]Safe Flash
Reinsert phone battery.
Battery must be charged.
Phone must be off with battery inside.
Please insert USB cable now...
Detected : MediaTek PreLoader USB VCOM (Android) (COM19)
Boot mode: Preloader
Phone detected...Please wait
Sending DA agent, please wait...
Using Algo 2.
----------------------------------------------------
BaseBand CPU :MT6735
BaseBand CPU Secure Version : FF
BaseBand CPU Bootloader Version : 01
----------------------------------------------------
INT RAM: 128 KB SDRAM
EXT RAM: 1 GB DRAM
----------------------------------------------------
EMMC: (58Gb+8192Mb) HYNIX 0x483847316505
EMMC FW VERSION: 07:00:00:00:00:00:00:00
EMMC CID: 90014A48384731 : 000000000000000000
EMMC UA SIZE: 0x1d2000000
BOOT STYLE: EMMC BOOT
FULL LENGTH: 0x1d2c00000 [7.293 GB]
Preloader SEC version: 2
Status: USB_HIGH_SPEED
Detecting high speed port, wait......
If driver not installed, install high speed port driver.
If not need high speed port, disable it.
After repeat opperation.
Detecting high speed port, wait......
Detected : MediaTek DA USB VCOM (Android) (COM20)
Warning, flashing preloader disabled!
If you change android version, preloader must be flashed.
Flash EMMC Algo Start.
Preloader backup already exist, skip saving.
Starting flash.
Error: S_SECURITY_SECURE_USB_DL_IMAGE_SIGN_HEADER_NOT_FOU ND
Wait untill phone will start charging.
All done.