Sony Xperia Z2 - How to master reset
sony Xperia Z2 Hard Factory Reset
Sony XPERIA Z Z1 Z2 Z3 Z5 - Hard Reset, Unlock Password, Screen Lock removal
Hard Reset SONY Xperia L C2105 - Reset All SONY Xperia
Hard Reset will erase all of your data
All described operations you are doing at your own risk.