It appears that such is not user serviceable. That is, once you do this, you have to arrange for Samsung to fix the set.
By mistake I changed the model type from the service menu. Now the TV turns on, shows a black screen (little more bright that when it is on standby) for about 5 seconds, then it shuts down and i cannot even use the remote (when its off). Then it boots again for 15 seconds and goes off again and again on its own. I don't use the remote to turn it on, it just goes by itself.
I tried some key combinations to get to a menu to restore it or something but nothing works.
Is there a way to stop the boot so i can use the service menu again or to reset the tv with the exit button? I just need to change back the model...