A hard reset will permanently delete all internal data. Ensure you have backed up any important files before proceeding. Hard Reset SONY ERICSSON Xperia Pro MK16i
Once the LED light changes to or the phone vibrates, release the buttons. Sony Ericsson Xperia Mk16I Hard Reset
You can perform a hard reset on a Sony Ericsson Xperia Pro (MK16i) using either the software settings or a hardware key combination if the device is locked. A hard reset will permanently delete all internal data