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Samsung Galaxy S4 Problem [Need Help Badly]

21st April 2014, 05:10 PM   |  #1  
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So, I had tryed to install at root and flash a Rom onto my Samsung Galaxy s4 i337 using MF3. I was running Android 4.2.2 and when I had tried to unroot my device, something happened and I wasn't able to FULLY get the root off my device. A couple days ago, I had wanted to upgrade to the Android KitKat 4.4 so when I completed the process. It went into Download mode, and then just crashed. Right now it shows an error message saying

"System software not authorized by AT&T has been found on my phone. Please turn off your phone and go to the nearest AT&T store for help."

Also in the top left hand corner it says Secure fail:Kernel so obviously it means I am missing a Kernel of some sort.

Please help me!
21st April 2014, 05:55 PM   |  #2  
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How were you trying to upgrade - via OTA? So you have not successfully flashed 4.3 or 4.4.2 through Odin, correct? But you should be able to find everything you need here:


There's a couple different ways to go depending on if you are trying to save your bootloader to be able to downgrade again easier, if wanted, or not.
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