In order to hard reset a Acer Liquid mini E310, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Acer Liquid mini E310 device will be brought back to the default configuration of a brand new device.
1. First of all, please turn your phone on.
2. Next, do press and hold together Volume Down + Power button until the phone vibrates just once.
3. Quickly release Volume down and press Volume up. You will see a new menu on screen.
4. Now use Volume buttons to select the "Recovery" option.
5. A new menu will open. From it, choose "Wipe data/factory reset" using Volume buttons to browse options, and Menu button to confirm operation.
6. Now, confirm the whole operation by selecting "yes - delete all data" with Menu key.
7. Choose option "reboot system now". Voila.