How to safely shut down or force shut down Huawei devices

Huawei Ascend G628 Huawei Ascend G628
Huawei Ascend Y540 Huawei Ascend Y540
Huawei Y360 Huawei Y360
Huawei Y635 Huawei Y635
Huawei MediaPad X2 Huawei MediaPad X2
Huawei SnapTo Huawei SnapTo
Huawei P8 Huawei P8
Huawei P8max Huawei P8max
Huawei P8lite Huawei P8lite
Huawei P8lite ALE-L04 Huawei P8lite ALE-L04
Huawei Honor 4C Huawei Honor 4C
Huawei Y625 Huawei Y625
Huawei Y560 Huawei Y560
Huawei Honor Bee Huawei Honor Bee
Huawei MediaPad M2 8.0 Huawei MediaPad M2 8.0
Huawei Honor 7 Huawei Honor 7
Huawei G8 Huawei G8
Huawei Y6 Huawei Y6
Huawei Honor 7i Huawei Honor 7i
Huawei Mate S Huawei Mate S