Using the hardware keys to remove password or reset the gesture lock. This tutorial will teach you how to remove password on your Galaxy A5 aka SM-A500 Andorid phone.
Turn off the phone completely. Press and hold both Volume UP and HOME + power on the phone. When Android Recovery menu screen appears release all keys. Navigate and highlight "wipe data / factory reset" using the Volume down key and press power. Navigate and highlight again to Yes -- delete all data and press power. All data will be lost! Before doing a hard reset backup all important data. After hard reset is done select Reboot system now. Press power to reboot the phone.