Rooted Android won't connect to WiFi

[Android Central Question]

I have a Samsung GT-N8013 note 10.1 I bought used off eBay. It appears to have been rooted. It has superuser and WTRP on it. I'm completely illiterate when it comes to all this rooted business. I would like to unroot it but I'm totally lost. Honestly if I can get the Wi-Fi to work is leave it alone. I tried uninstalling superuser but it just spins and spins. I have an SD card but I'm lost as to what to put on it.

Please help! Also keep in mind I know very little about this so please try to be thorough in your response, small steps.
Thank you in advanced for your help!!

 

[Rukbat]

Removing root is more than uninstalling Superuser. Superuser is just an app that keeps a list of apps you've told it can access root when they ask for it.

Try [Samsung] How to flash Stock ROM via ODIN, Samsungs are pretty easy to flash. (After Odin finishes it's going to take 10-15 minutes of watching grass grow, so do it when there's a good TV show to watch.)

However, rooting and TWRP shouldn't affect Wifi - all of my devices have both (as an old hand at Linux [which is the OS on an Android phone] I just can't run without su [which is root], and I find TWRP handy - like for backing up before an update, in case something goes wrong [which happened twice already on my 2 month-old phone]). I suspect that the tablet has a problem, and your best bet, if you can (or contact eBay if you can't) is to return it for a refund.