If you own a single SIM slot Huawei P8, chances this firmware is compatible with your mobile phone. The Build number if GRA-L09C02B404 (build 404) and it contains the Android Security Patch Level dated 6 Nov 2017.
Unzip and move the file to SD card’s dload directory.
Enter engineering mode by keying in *#*#2846579#*#*
Go top option 4 – Software Upgrade
Choose 1. SDCard Upgrade and Click OK to continue and follow the instructions.