Back in the early days of Android, system updates were very random: they would roll out at different times, and often several times per year. Now, Google has taken a much more streamlined approach, releasing one major Android update per year and much smaller, security-focused updates once per month.
But if you’re not running a stock Android handset that is updated by Google—like a Nexus or Pixel device—who knows when, or even if your phone will ever even see any of those updates.
New Android users are often disappointed to discover that their shiny new smartphone won’t get any updates—or worse, that it’s running old software the moment they bought it.
The Android Ecosystem
Unlike Apple’s ecosystem, where Apple releases a single iPhone each generation, Android is a much more open (and messy) environment. Any manufacturer can make a smartphone or tablet, throw Android on it, and release it. While there have been 14 different iPhones released since 2007, thousands of different Android phones have been released in the same period of time.
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http://www.benzhub.com/2017/12/why-your-android-phone-isnt-getting.html

Just updated my jiayu s3 basic yesterday with mad os custom rom.

Mustack:
Just updated my jiayu s3 basic yesterday with mad os custom rom.

Screen shots..please