You can restore your Huawei P8 back to Lollipop OS from Marshmallow using the official B300 transition firmware package provided by Huawei for Europe.
Transition Firmware Details
Device: Huawei P8
Model: GRA-UL00
Android: v6.0 Marshmallow > v5.0 Lollipop
Build: GRA-UL00C900B300
Status...
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