Yes, you read the title right. There will be no Triangle Away for Samsung Galaxy S4 GT-I9500 Exynos 5 Octa core model for the moment based on Chainfire Google+ post (link). As mentioned by XDA user, sorg, I9500 has boot block hardware write protection. And Chainfire does not own I9500 so it is tiresome for him to do the development. Until he has a I9500 to develop Triangle Away for Galaxy S4 I9500 or other developers have a workaround to reset the flash counter and kernel binary status, your Galaxy S4 is officially warranty void if you had rooted it.