Linksys wrt 1900 ac

Hello everybody, I'm new here, I just bought my 2nd hand Linksys wrt 1900 ac router which cames with OpenWrt pre installed, the problem is that I don't really understand it and I'm not able to connect to internet once i plug the ethernet from my modem to the router.
I'm sure it must be configured but I don't know how to do it.
I'm wondering if there is a way to restore the original factory firmware which I'm sure it will be easier to understand and set up for a person like me that doesn't understand much of this kind of stuff.
Thank you all for your help

See wiki, also search this forum as been many threads re. issue.

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