(adsbygoogle = window.adsbygoogle || []).push({}); If i change my CID, go online and after change again the CID with another banned, can stay online with a CID banned?

Once you're signed in you can change your CID to a banned one yes.

Doing this protect my CID( not banned)?

Honestly once you're signed in even if you set it to a banned one afterwards Sony still sees your real CID so there's really nothing you can do about that unfortunately.