How to flash your smartphone with your hand without the use of computer software 2018 latest

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STEP one From power off,
STEP two  hold the VOLUME DOWN key,
STEP three then press and hold the POWER button until you see the boot menu
 STEP four Use VOLUME DOWN key to scroll to FACTORY RESET and tap the POWER button to select

The device will reboot and go through the

STEP five wipe process, then
STEP six reboot  the phone again
Note before you hard restart any phone charge it up to 75 percent