[Q] Huawei GR-5 back to stock problems, can someone help?

As the title says, i am currently trying to get back stock and update it to MM build to get latest version of CM13 rom. But tried every god-damn method nothing worked. It says software install failed. Tried a lot of recoveries and ROMs which are official for GR5 aka honor 5x.

Tried recoveries:

KIW-L21 B140
KIW-L21 B130
KII-L21 B130

Tried firmwares:

Huawei_GR 5_Firmware_KII-L21_Android 6.0.1_EMUI 4.0_C636B310CUSTC636D001
Honor 5X_Firmware_KIW-L21_Android 6.0.1_EMUI 4.0_C432B330CUSTC432D001_Denmark


TWRP backups are working fine. But does not updates it to marshmallow. I think i need MM TWRP backup of it. If someone has please post it below so it will help other people as well as me.

It keeps saying software update failed. Doesn't even loads %1. And if i do this process with TWRP backup or CM installed device it still does not lets me install stock firmware.

I really don't know why it does like this since all the people can able to flash it to their devices while i cannot able to do it. I am facing this issue and it bugging me a lot.

Note: Both of the KIW-L21 and KII-L21 same model since 5.1.1 works both. Yet still does not lets me update the ROM to 6.0.1. so i think i need a MM TWRP backup if possible.