How to safely shut down or force shut down Allview devices

Allview V1 Viper e Allview V1 Viper e
Allview AX5 Nano Q Allview AX5 Nano Q
Allview Viva H7 Xtreme Allview Viva H7 Xtreme
Allview Viva Q7 Satellite Allview Viva Q7 Satellite
Allview V1 Viper L Allview V1 Viper L
Allview Viva Q8 Pro Allview Viva Q8 Pro
Allview P6 QMax Allview P6 QMax
Allview Viva H8 Life Allview Viva H8 Life
Allview WI7 Android Allview WI7 Android
Allview A5 Quad Plus Allview A5 Quad Plus
Allview A6 Duo Allview A6 Duo
Allview A5 Lite Allview A5 Lite
Allview A6 Lite Allview A6 Lite
Allview A7 Lite Allview A7 Lite
Allview Viva i7G Allview Viva i7G
Allview X2 Soul Style+ Allview X2 Soul Style+
Allview Viva i10HD Allview Viva i10HD
Allview C6 Duo Allview C6 Duo
Allview Viva i701G Allview Viva i701G
Allview Viva H801 Allview Viva H801