How to safely shut down or force shut down Elephone devices

Elephone P3000s Elephone P3000s
Elephone G4c Elephone G4c
Elephone G4 Elephone G4
Elephone G6 Elephone G6
Elephone G5 Elephone G5
Elephone P4000 MT6592 Elephone P4000 MT6592
Elephone P8 Pro Elephone P8 Pro
Elephone P6000 Elephone P6000
Elephone G7 Elephone G7
Elephone P5000 Elephone P5000
Elephone P7000 Pioneer Elephone P7000 Pioneer
Elephone G1 Elephone G1
Elephone P3000 (MT6732) Elephone P3000 (MT6732)
Elephone G2 Elephone G2
Elephone P3000s (6752) Elephone P3000s (6752)
Elephone Vowney Elephone Vowney
Elephone G9 Elephone G9
Elephone P4000 Elephone P4000
Elephone P8000 Elephone P8000
Elephone S2 Elephone S2