If you spoof to 5.5.0, update your games with wup installer instead of the console only, and change the dns settings to use tubehax, you can use discs to play online fine.
You can not reverse/undo/downgrade the spoof, as it updates a single system title. You should be able to update to official 5.5.0 if you really wanted to, or so it's been said. (I have not done it myself.)
Thank you for the reply, so correct me if im wrong here, im going to use splatoon as an example, if i spoof the firmware to 5.5.0 then my son can play splatoon from the disc even though im still on 5.3.2 once i block updates am i right? im not worried about updating as id like to stay at this firmware for the obvious reason, im just afraid of doing this now and my son not being able to play his games i got him for xmas!!
Thanks again