Remove Xperia Arco S Pattern Lock Via Keys
https://gsmfixer.blogspot.com/2016/03/remove-xperia-arco-s-pattern-lock-via.html
Hard Reset SONY Xperia Arco S to remove pattern lock and to get Xperia Arco S hang on logo problem. This process will completely wipe your phone and get it ready for new owner too if you want to sell it. Format SONY Xperia Arco S to get default phone settings as new phone. Here are some simple steps to follow.
Hard Reset SONY Xperia Arco S Via Hardware Keys:
Power Off >> Press and hold Volume Up + Power Button >> Release when vibrate >> Select "wipe data/factory reset" using volume keys >> Confirm by pressing power button >> Now confirm "reboot system now" >> wait a while >> that's it!