Acer Z2 Liquid hard reset
1.Shutdown the phone
2.Power it on with Power + Vol- (will appear Acer logo and the phone will vibrate)
3.Once it vibrates, release Vol- and push Vol+.
4.The phone will vibrate again, release Vol + it will boot in recovery mode.
5.Use Vol- & Vol+ to highlight "Wipe data/factory reset" and use meniu to select.
6.Confirm "yes - delete all data".
7.Select "reboot"
Here you have video tutorial:
GSM-ABC