How to safely shut down or force shut down ZTE devices

ZTE Q7-C ZTE Q7-C
ZTE Blade A450 ZTE Blade A450
ZTE Blade Q+ ZTE Blade Q+
ZTE Blade V2 Lite ZTE Blade V2 Lite
ZTE Fit 4G ZTE Fit 4G
ZTE Blade A476 ZTE Blade A476
ZTE B880 ZTE B880
ZTE Paragon ZTE Paragon
ZTE Zephyr ZTE Zephyr
ZTE Fanfare ZTE Fanfare
ZTE Q519T ZTE Q519T
ZTE Overture 2 ZTE Overture 2
ZTE Lever ZTE Lever
ZTE Blade Q Lux 4G ZTE Blade Q Lux 4G
ZTE Blade Apex3 ZTE Blade Apex3
ZTE V3 Extreme Edition ZTE V3 Extreme Edition
ZTE V3 Energy ZTE V3 Energy
ZTE V3 Youth ZTE V3 Youth
ZTE Warp Elite ZTE Warp Elite
ZTE Blade AF3 ZTE Blade AF3