Looking Tecno-RAC DA FILE HOW DO I GET custom DA from phone firmware

Action : Boot Info.
Selected 0-By CPU:ELBRUS
Exe version: NCKBox AndroidMTK 1.8.9.6
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) (COM7)
Boot mode: Preloader
Phone detected...Please wait
BBCHIP: 6739 0 ca00
Using Algo 5.
Helio MT6739 phone detected, swithing to helio api
Helio connect da error, aborting.
BBCHIP MT6739
[SECURE BOOT]Not supported by exe or wrongly selected, aborting
If model is listed, please select correct model
If model is not listed, use custom DA from phone firmware
Boot Fail.!!!.
All done.