My phone model samsung a20.. how can i solve this problem.?

I have a problem with samsung a20.. it has overheating problem. When i turn it on after sometime it automatically shutting down.  and there is a message your device is overheating due to running some application.. but i uninstall all the apps. but ye...

When i get android version 9 for my galaxy j7 prime..

Is J7 prime eligible for oreo update???