Make sure the battery fully charged
Backup all your important data
Power Off Your Alcatel One Touch MPOP 5020
Press And Hold Volume up Key + Power Key
Now You Will see a boot menu on screen
Press Volume Down to enter Recovery Mode
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: Hard Reset Alcatel One Touch MPOP 5020