Make sure the battery fully charged Backup all your important data Power Off Your Sony Xperia E3 and E3 Dual (D2212) Press And Hold Volume up Key +Power Key Now You Will see a Android Robot on screen Select " Wipe Data / Factory Reset " Option By Using Volume Key . Press Power Key To Confirm. Now Select " Yes ----- Delete All User Data " And Confirm Select Reboot Option And Wait That is all ! - See more at: How To Hard Reset Sony Xperia E3 and E3 Dual (D2212) Step By Step Tutorial