Yes, Android 4.3 firmware has been leaked for Samsung Galaxy S4. Even though it is a leaked firmware, it is very stable and much faster than Android 4.2.2. This version comes with many new improvements and enhancements. Now Samsung Wallet is a default app and Samsung Knox, which is an application to protect your phone, seems to be working perfectly without any problems.
Keyboard is improved for a better typing experience and there is a new Reading Mode which optimizes the screen to make everything look sharper. And another big improvement is the color reproduction. This means that colors are improved and there’s less black clipping.
Note: This leaked firmware is compatible only with GT-I9505 Galaxy S4 variant.
How to install it?
As usual, first download Odin3 v3.09 here and leaked android 4.3 firmware here. Then put your phone into download mode by turning it off andthen pressing and holding at the same time Volume Down + Home + Power button. Then open Odin3 v3.09 and flash the downloaded firmware. Oh, and don’t forget to do a factory reset, unless you want to get stuck in a bootloop.
Do you have any questions? Leave a comment below.