How to safely shut down or force shut down Allview devices

Allview X4 Soul Infinity Z Allview X4 Soul Infinity Z
Allview X4 Soul Infinity Plus Allview X4 Soul Infinity Plus
Allview P4 Quad Allview P4 Quad
Allview X4 Soul Vision Allview X4 Soul Vision
Allview P9 Energy S Allview P9 Energy S
Allview A9 Lite Allview A9 Lite
Allview P7 Lite Allview P7 Lite
Allview P9 Life Allview P9 Life
Allview P43 Easy Allview P43 Easy
Allview V3 Viper Allview V3 Viper
Allview P8 Pro Allview P8 Pro
Allview A9 Plus Allview A9 Plus
Allview Soul X5 Pro Allview Soul X5 Pro
Allview Soul X5 Mini Allview Soul X5 Mini
Allview Soul X5 Allview Soul X5
Allview P10 Style Allview P10 Style
Allview Soul X5 Style Allview Soul X5 Style
Allview A10 Lite Allview A10 Lite
Allview A10 Plus Allview A10 Plus
Allview P10 Life Allview P10 Life