Why is Software Update option missing on my S4 device?

I have Vivax Smart Fly X50 and I don't have system update option too. I've bought three years ago and I recently I have rooted my phone.

My CPU is: 4x ARM Cortex-A7 @ 1.20 GHz
 
Welcome to Android Central! If it's a knockoff or clone, then there are no official updates, since it's not from Samsung. You could try messing around with rooting and installing a custom ROM, but that may be difficult, since custom ROMs are designed for specific devices. Otherwise, I can only recommend making sure you get a genuine device in the future.
Could you tell me how to do this? I'd really like to get different software because I got a ripoff too (99.99% sure). The one I'm using is pretty bad.
 
Welcome to Android Central! I'm sorry, I don't have any experience with rooting, much less trying to find a custom ROM for a knockoff phone. It's highly unlikely that there would be one available for a knockoff anyway. Sorry!
 

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