Just bought used WiiU - first step?

Hi. Just bought a used WiiU that is still on 5.5.1. I haven't done anything with it yet and I just want to make sure my ducks are in a row before I proceed, as I'd like to stay on 5.5.1 and install haxchi eventually.

Here are my questions/plans.
- Any harm in doing a factory reset? The person I bought it from did not do so before he gave it to me. (The WiiU has not been previously hacked.)
- my next step would be to setup an internet connnection w/ DNS setting to prevent updates, then create new Nintendo ID.
- I would then follow the guide to get browserhax, to homebrew, and run nnu patcher so that I can access eshop while on 5.5.1.
-Once in eshop, i'll buy a legit ds game "brain age" and install haxchi per guides.

Thanks for all your help in advance.

 

Thanks! I'll double check every folder looking for any traces of CBHC before I proceed. Better safe than sorry.

This actually my 2nd WiiU. The "main" one that I've had for a while has haxchi only and is more for the kids. For this new one is more for me to play around with; I got what I considered a great deal on it, and look forward to unlocking its full potential. (I.e, i plan on hacking vWii on this unit eventually, getting retroarch latest version running, CBCH, forwarders, etc).