Before starting I'd recommend reading up on it, it is possible to get yourself in to a bumcheek clenching situation lol
Be sure to get the proper firmware for your carrier and region too. If you look up what the firmware number means you'll find good explanations so you can search the correct thing.
If you do get the blue screen of misery the solutions using Google are generally outdated too.
Something is terrible wrong. Since the update my phone is just performing bad! Freezing, slow, battery discharge, fixing everything or adding. Who someone here said or mention a class action lawsuit? This is really bad. Is a phone that does not work at all! Unbelievable they dare to do this stunt!
Now I'm being pushed to update to Pie. LOL
Hopefully , I can pause the update indefinitely.
Did you switch off all the auto system update including in developer options?
You can also turn off the notification but can't remember how off hand
I did switch it off in developer options on the note 8, so far so good. Not so good for the note 9 however, I did not think Samsung would commit larceny so it rests in the box it came in.