Requirements;
==>A PC windows 7 preferably
==>Vcomm drivers manually installed on your PC if not
installed follow this guide here to install it
==>Miracle box download here
==>A USB chord that supports mass storage(that can send
files when connected to system)
==>Your brain

Procedures
1. Diasble your antivirus otherwise it will delete
miraclebox.exe extract miracle box now open miracle box
2. Click on the MTK tab
3. Click on the Unlock/fix tab
4. Tick the reset code
5. Click the dropdown menu to choose your android chipset
type MT***
6. Click on the start button
7. Connect your phone to PC make sure it is switched of now
(with the battery inside)
8. press the power button once this will make the phone
communicates with the PC do not hold down the power
button or else it won't work.
9. Wait till the process is done Disconnect your phone from
pc then power it on.
Congratulations you just bypassed your pin, password and
pattern unlock.

read this tutorial step by step guide with image
http://www.techfashy.com/2016/08/how-to-bypass-forgotten-pattern-pin-and-password-without-wiping-your-data.html?m=1