Remember this ROM is still in early stage therefore please be not too shocked if you found some of the features don't work as you wish they will. And also to flash this ROM you need to firstly root your Galaxy S4 first and install a custom recovery like ClockWorkMod recovery.
Ready to follow the instructions? Good, but please read the following first will you.
- Backup the Android data.
- Enable Android USB debugging mode first.
- Be sure you have fully known that following the instructions on this post means all the results following them is entirely your responsible to take.
How to flash Android 4.3 CM10.2 ROM on AT&T Galaxy S4 SGH-I337
Step 1 -Download CM10.2 ROM Jelly Bean build and download Google apps to your computer and store it in the place you can easily find like Desktop for example. (see apps for Android)
Step 2 -Now plug your smartphone to the PC of yours using a USB cable.
Step 3 -Then copy this Android 4.3 ROM and Google Apps zip and paste it to your SD card. Place the files in the SD card root.
Step 4 -Now shut down your phone, then unplug your device from USB.
Step 5 -It is time to enter the Recovery mode. Simply turn your device ON at the same time, press and hold these buttons simultaneously: Volume Up + Home + Power.
Step 6-And within the ClockworkMod recovery, do a full data wipe first. Then find this “install / install zip from SD card” then click and hold the Power button to select it.
Step 7 -Again press Power then choose “choose zip from sdcard”.
Step 8 -Use the volume keys to go to the Android 4.3 zip you pasted to SD card, then choose it using the Power button. Then on the next screen confirm the installation for it to begin. (Do from step 1 to step 8 again to install Google Apps).
Step 9 -Once the installation is completed, head to “+++++Go Back”. Then reboot your device, by choosing the “reboot system now” on the recovery. Your device will take reboot, this process may take few minutes, therefore just wait.
Done my friends.