This is the Stock ROM for HUAWEI GR5 KII-L23
This is the update file. KII-L23_Open Market_Colombia_C25B130CUSTC25D005_Firmware_Android 5.1.1_EMUI 3.1
img files can be extracted using "huawei update extractor"
1 ° unlock bootloader
2 ° install twrp from link above (allowing to mount cust, tsz, etc)
3 ° download the rar file of the update and decompress.
4 ° Extract the .img files to the SD card using the "huawei update extractor". (also put supersu zip file)
5 ° Enter twrp and do wipe everything except the sd card.
6 ° enter the install tab and at the bottom right it says "install img". And there you press the "select storage" And choose the sd card. Then install each .img on its respective partition.
Boot.img in boot.
System.img in system.
Cust.img in cust.
Tsz.img in tsz.
Etc ….
7 ° Install supersu zip.
Then make a factory reset (optional) and press reboot system.