Alcatel Idol 4S 6070K - Manual (Page 126)

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After factory data reset is performed, you will be requested to
enter Google account credentials (1) used on this device before
reset. Otherwise you can't use the device. If you don't remember
your Google account credentials, please complete Google account
recovery procedure. In case you don’t succeed in it, apply to
authorised repair center, but remember that it will not be regarded
as warranty case.
and carry out the following checks:
My phone can't be switched on or is frozen
• When the phone can't be switched on, charge for at least 20 minutes
to ensure the minimum battery power needed, then try to switch
on again.
• When the phone falls into a loop during power on-off animation
and the user interface can't be accessed, press and hold the Volume
down key to enter Safe Mode. This eliminates any abnormal OS
booting issues caused by 3rd party APKs.
• If neither method is effective, please reset the phone using the
Power key and the Volume up key (holding both together) or
upgrade software via Mobile Upgrade tool.
My phone has not responded for several minutes
• Restart your phone by pressing and holding the Power key.
• If it still does not work, please use Factory data reset to reset the
phone or FOTA/Mobile Upgrade to upgrade software.
My phone turns off by itself
• Check that your screen is locked when you are not using your phone,
and make sure the Power key is not accidentally contacted while the
screen is unlocked.
• Check the battery charge level.
• If it still does not work, please use Factory data reset to reset the
phone or FOTA/Mobile Upgrade to upgrade software.
(1) Applicable for Android OS versions starting from 5.1.