I have done a clean install with Zorin OS 15.3 to 16.0 but now i have this problem down below:
Default Boot Device Missing Or Boot Failed. Insert Recovery Media and Hit any Key Then Select 'Boot Manager' to choose a new Boot Device or to Boot Recovery Media.
Could you tell me how you created installation media?
For Zorin 16, Etcher is the recommended.
Also please make sure that you have downloaded the (fixed) version of Zorin 16. The earlier version has Ubuntu upstream bug.
That seems to be the problem.
I tested all sorts of Live USB creators, the only thing that worked was Etcher.
I recommend you to make another installer with Etcher.