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Root [AT&T] safe way to update from 4.2 to 4.4?

I have a Samsung Galaxy S4 SAMSUNG SGH I337 4.2.2. Broadband version I337UCUAMF3 kernal version 3.4.0-812098. se-infra@SEP-103#1
Build Number JDQ39.I337UCUAMF3
SELenix status permissive. With AT& T
 
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