Huawei P8 (GRA-UL00 & GRA-L03) has received a new B361 Marshmallow based update in the Middle Eastern countries. This update is based on Emotion UI 4.0.1 and comes with security patch level of June 1.
Full C10B330 Android 6.0 Marshmallow firmware for the Russian Huawei P8 (GRA-UL00) is now available for download via the official link provided below.
Android 6.0 Marshmallow update (C636B320) is now out for Huawei P8 (GRA-UL00 & GRA-UL10) variants in several Asian Pacific countries.
You can restore your Huawei P8 back to Lollipop OS from Marshmallow using the official B300 transition firmware package provided by Huawei for Europe.
Huawei has published the stock C470B180 Android 5.0.1 Lollipop firmware (EMUI 3.1) for its P8 GRA-UL00 flagship from South East Asian region. You can download this firmware as Update.app package here.