GRA-L09 (Huawei P8) UPDATE TO 5.1.1

Good morning everyone:
I have been reading around on the developers forum about the upgrade to 5.1.1 but since I'm new in this forum I cannot post anything there , so this is my question:
How can I upgrade my GRA-L09 (Huawei P8) with V100R001C469B150 CUST521D001 to Android 5.1.1 which is the B350 if i'm not wrong.

Thanks for your help

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