1. Charging Your battery up 80%.
2. Make sure that you have enabled USB debugging.
(All Apps---> Setting--->Manage Application---> Development--> USB Debugging-->Check box)
3. The Samsung Galaxy S3 i9300 must be rooted and Install CWM recovery.
Must Read:- How to Root & Install CWM Touch Recovery in Samsung Galaxy S3 GT-I9300
4. Download Android Unofficial 4.4 kit-kat :- Click Here to Download
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