koleksiromandroid

a leaked version of Android 4.3 for Galaxy S4 was available for download couple of days ago. ppl claimed it is stable and performance boost observed

note that this is a pre-release or test version but it will not increase your flash count


image source: sammobile.com


download link:
link 1 - original Odin files by sammobile
link 2 - pre rooted Odin or cwm file