Disclaimer : I'm not responsible if your phone suddenly dies, explodes or your cat catches fire. Be warned.
SOME PEOPLE REPORT MOBILE DATA NOT WORKING AFTER THIS PROCESS SO ALL YOU GOTTA DO IS GO INTO YOUR APN SETTINGS MENU AND DO RESET TO DEFAULT SETTINGS AND WRITE YOUR CARRIERS APN SETTINGS AND IT WILL WORK.
This process has a lot of steps but if you follow them correctly you will end up with stock rooted 4.4.2 kitkat with super user and safestrap
If you already took the update and your system version is 4.4.2 keep reading.
2. Pwned Kitkat OTA Update link
3. Pwnedkernel for 4.3 Download
4. System image from stock 4.3 Tar file Download
5. Safestrap for the Galaxy S4 Active Download
6. Stock 4.4 Kitkat Kernel Download
7. Chainfire's SuperSu.zip Download
First after you finish downloading the stock 4.3 image extract it somewhere you remember and you'll see the following files:
Put your phone in download mode and fire up odin. Under PDA select and flash
This will downgrade your system back to 4.3 because yes the new kitkat bootloader allows you to flash 4.3 signed firmware. Note: YOU CANNOT DOWNGRADE BOOTLOADER SO DONT ATTEMPT IT
Wait until odin finishes flashing the firmware and when the phone reboots itself put it again in download mode. Now you must flash pwnedkernel.tar.md5 selecting PDA again in ODIN and wait for phone to boot up. If your phone gets stuck in the ATT logo then perform a factory reset .
Once your phone boots up enable USB debugging mode and root it using saferoot or vroot. GOOGLE it and you'll find it...Then you must install safestrap.apk
adb install safestrapactive.apk
Now you'll be at the safestrap recovery screen so go ahead and select install zip file.
IMPORTANT : DO NOT DELETE DATA/CACHE OR DO A FACTORY RESET BEFORE FLASHING THE KITKAT.ZIP OTHERWISE YOU'LL HAVE TO START ALL OVER AGAIN.
Install pwnedkitkat.zip and once it finishes go ahead and install update-supersu.zip to enable root access.
AND FINALLY VERY IMPORTANT YOU MUST FLASH THE 4.4.2 STOCK KERNEL IMAGE USING ODIN AND SELECTING PDA OTHERWISE YOUR PHONE WONT BOOT
Wait for your phone to reboot, open up superuser and disable knox security.
Enjoy your rooted 4.4.2 S4 Active.
Credits : hashcode for making safestrap possible and the other amazing developers at XDA that discovered these exploits in the past and special thanks to Samsung for "letting" open these loopholes
If you are in official 4.3 ML2 see my next post.