I've got an S4 Active on 4.2.2, which is the OS I received it with.
I purchased it from the USA, got it shipped to me in Canada, unlocked it, and activated it on Telus.
I can't get OTA updates because Telus in Canada doesn't even carry this phone (so I still have the ATT rom on it). However, when I plug it in and fire up Kies, it says "This is the latest firmware. Current firmware version: PDA:MF3 / PHONE:MF3 / CSC:MF3 (ATT)"
Baseband: I537UCUAMF3, Kernel is 3.4.0-784654
SELinux status: Permissive
Secure boot status: Type:Samsung
Any suggestions for what to do in order to update the OS on this phone?