[Galaxy S 4 Active Q&A, Help & Troubleshooting] bengalfreak:
A little background. A few months ago I purchased a Samsung Galaxy S4 Active SG-I537 from a person on Craigslist after my HTC One M7's microphone died. Anyway, I thought the phone was fully stock. I started to become suspicious that this was not the case when I checked for software updates from AT&T and the updates began to fail repeatedly. I downloaded a root checker from the Google Play store and, confirming my suspicions, I had root access. I didn't really like finding this out this way, but it was my own fault for not asking. Having installed CyanogenMod on both a Galaxy S1 Fascinate and an S2 Skyrocket, I knew something about these things and decided to just live with it as the phone seemed to work otherwise.

Recently I tried playing video on my DirecTV app and found that the app would not function on a rooted phone. That coupled with the fact that I am hearing that Android 5.0 Lollipop will soon be released for the S4 Active made me want to return the phone to a stock firmware. So I began reading. The problem I have is that I have no idea whatsoever how the phone was rooted. I know that the firmware was 4.2.2 UCUAMF3. So I downloaded ODIN and the full ODIN package of UCUCNE3 and then followed the below guide to a T.

Everything seemed to work, I got a pass green light from ODIN. But I have a circle with a line thru it where the AT&T wording usually appears. The 'about device' page in the settings also says 'Baseband version' is unknown. and I have no cell abilities. I can do everything from the smartphone end via WiFi. But I have no cell phone capabilities. Can't make calls, etc. What I need now is someone to point in the proper direction of where to look for the knowledge on how to fix this problem. Any help would be greatly appreciated.

Thanks.

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MF3 to MF2 (Official: Released 2013-06-21)

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MF3 to MF3 (Official: Released 2013-06-21)

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MF3 to MI2 (Leaked: Released 2013-09-25)

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MF3 to ML2 (Official: Released 2014-01-07)

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MF3 to NC9 (Official: Released 2014-04-16)

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MF3 to NE3 (Official: Released 2014-06-06)

Download the NE3 Full Odin Package from the i537 Firmware Thread.
Extract SGH-I537UCUCNE3_v4.4.2_ATT_ALL.zip using a program such as 7-zip.
Download the Windows program Odin. For more information about what Odin is and where to get it, please read the Odin section in the first post.
Open the version of Odin that you downloaded (preferably Odin v3.07)
Once opened, you need to load the files for the Bootloader, PDA, Phone, and CSC. The required files are located in the Odin Files folder. It should look exactly like the screenshot below with the appropriate checkboxes checked.
Next put your phone in download mode. For more information on how to put your phone in download mode, please read the download mode section in the first post.
Once your phone is in Download Mode, connect it to your computer using the cable that came with your phone. IMPORTANT: Odin and Samsung phones are very finicky when flashing firmware, the only usb cable that is guaranteed to work is the cable that came with your phone. You may use other usb cables, but Odin may not detect your phone. If Odin does not detect your phone try connecting to a different usb port or a different computer.
If your phone has connected properly it should show up properly in the Odin window similar to the following picture:
Once Odin has detected your phone, hit Start. It will take a long time to flash the package to your phone and will completely wipe your phone. DO NOT DISCONNECT THE CABLE OR TURN OFF YOUR COMPUTER. If the process is abruptly interrupted you risk permanently bricking your phone, so be careful.
When the program has finished it is safe to disconnect everything and reboot your phone. Your phone will be completely stock, unrooted and you will have to setup your phone from scratch again. If you wish to root the NE3 firmware, please visit the towelroot website.