Choose and confirm by tapping Reset customization and reboot . The phone will restart and begin the formatting process. Method 3: Reset Using Sony PC Companion (Official Tool)
If you're still experiencing issues with your device after performing a hard reset, you may want to consider contacting Sony Ericsson support or visiting a authorized service center for further assistance. sony ericsson mt11i hard reset
Once in , use the volume buttons to navigate and the home/power button to select Wipe data/factory reset . Method 3: Service Menu (Secret Code) Choose and confirm by tapping Reset customization and reboot