Check out how to easily wipe cache partition in IRBIS TZ856. This operation won't affect your personal files it will only remove temporary cache files. As a result you can refresh Android 7.0 Nougat system and optimize MediaTek MT8321.
In the beginning, turn your device off. To do so press and hold the Power button, tap the Power Off option on the screen.
Then press and hold together the Volume Up + Power buttons.
When the Android logo with no command written under it appears on the screen you can release both buttons.
Then hold the Power button and press the Volume Up button to continue.
Now you should be in the Recover Mode. Use the Volume Up button and VolumeDown button to move through the menu.
Then scroll down to the Wipe cache partition and press the Power button to continue.
Next, scroll down to Yes and press the Power button to confirm.
Then select the Reboot system now and press the Power button to continue.