How To Reset -:
1) Firstly Make Sure Your Device Is Switch Off
2) Press Volume Down Key + Power key at Same Time
(If You Have Home Key Then Press Volume Down +Power + Home key at Same Time)
3) Now Press Volume Up And Down Key To Slide Down And Choose "Recovery"
(If Your Android Already Opened Recovery Then You Don't Need To Click on Recovery)
4) Slide Down By Volume Down key and Select
"Wipe Data/Factory reset"
5) Choose "Yes"
(Press Power Key To Press ok)
6) When It's Done Simple Click On "Reboot"
7) That's It you are done Now, If Your Device Have Any Password / pattern Then This Trick will Remove That Too.