Huawei p8 GRA-L09 C109B190 Marshmallow update

Hello, just want to know how to update my phone to Marshmallow?

Model: Huawei GRA-L09
Build: GRA-L09 C109B190
Android version: 5.0.2
EMUI version: EMUI 3.1


Thank you so much in advance :D :D :D