Install I337UCUFNB1 Stock 4.4.2 KitKat Firmware AT&T Galaxy S4 I337 (Updated)

Here’s the full stock firmware I337UCUFNB1, the official Android 4.4.2 KitKat update for AT&T’s Galaxy S4 SGH-I337.  The I337UCUFNB1 has been pushed on February 26 and replaces the old Android 4.3 I337UCUEMK2 version. The stock firmware can only be used by those who had their phone rooted and still did not received this update via

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