Yes, you can stay on 5.5.1. Yes, you can still play games online using 5.5.1. If a game requires a game update in order to be able to play online, you can install that update using Wii U USB Helper (recommended) or use NNU Patcher (not recommended unless you're using something other than a DNS to block updates).@Lacius So I can just stay on 5.5.1 if so can I still play games online?