downgrade?

I upgraded from 5.0.2 untethered to 5.3 tethered. I was wondering can I downgrade to 5.2.1 or below from 5.3?  The fact i dont like tethered  hate to tether everytime it restarts or power cut off. It was my first time.  I know I admitted its my fault.

 

 

 

Any help   thanks