Turn off the device
Press and hold Volume UP key + Home Key
While pressing these keys then press and hold Power key for a while
Release all key when Android or Samsung logo appear then you will see Android System Recovery
Use Volume keys to select Menu
Use Power key to Confirm
In Recovery Mode select wipe data / factory reset
Press Power key to confirm
Select Yes — delete all user data, press power key to confirm
select Reboot system now to finish hard reset
Perform a hard reset will fix your Boot Loop. I often do this when got boot loop. So don’t be panic, that you need to do is entering Recovery Mode and perform a hard reset.
Warning! If you perform a hard reset, make sure to back up important data. The data can not be recovered after perform a hard reset. If you forgot your unlock pattern, It will remove your forgotten pattern unlock.