Check out how to easily wipe cache partition in ITEL Wish A21. This operation won't affect your personal files it will only remove temporary cache files. As a result you can refresh Android 6.0 Marshmallow system and optimize .
In the first instance, you have to turn off your device by pushing Power Rocker for a few moments.
Afterward, hold down Volume Up and Power Key together for a short while.
Release the Power Key as soon as the Itel logo displays.
Hold the Volume Up button until the Recovery Menu appears on the screen.
In this mode, navigate to Wipe Cache Partition by using Volume Keys and to confirm that press Power Button.
When the Recovery Mode pops up once again, press Power Key to accept the Reboot System Now option.