You can reset your Sony Xperia acro S to its original factory settings which is the state it was in before you turned it on for the first time (of course all your personal data and customized settings will be erased then). You can also reset the phone to the original settings without erasing your personal data. It is strongly recommended to back any important data saved on your phone. To avoid permanent phone damage, do not restart the phone while a reset procedures is underway.

sony xperia acro s

Resetting Sony Xperia acro S without erasing personal data
1. From your Home screen, tap image
2. Find and tap Settings > Backup & Reset.
3. Tap Settings Reset > Reset Phone.
4. To confirm, tap Reset Settings.

Hard reset Sony Xperia acro S
1. From your Home screen, tap image
2. Find and tap Settings > Backup & Reset.
3. Tap Settings Reset > Reset Phone.
4. To confirm, tap Erase Everything.

Related Post:

Reset Nokia C2-01 to Restore Default Factory Settings
Hard Reset Sony Ericsson Vivaz Pro U8i to Restore Factory Settings
Hard Reset TomTom GO 2535 M LIVE to Restore Factory Settings
Hard Reset LG G Pro 2 to Restore Factory Settings
Factory Data Reset Nokia Asha 500 to Restore Default Settings