Setting up new LG G5 TV and new to me XG1v4 Box after lightning struck my old TV and box. Xfinity remote is not pairing.

I really could use some help. I am trying to set up my new LG G5 TV with a new to me (used) Xfinity box XG1v4. Last night there was no signal for hours on my old 1v4 box. I switched HDMI cables, HDMI ports, unplugged and replugged from outlets multiple times. Through texts, Xfinity claimed all was fine on their end. I think not. I finally decided when the TV was struck by lightning the cable box was as well. After googling this thought, AI stated it was highly likely it was damaged due to the HDMI cord and cable being connected between the two. 

I just picked up a new to me cable box and remote today. I think it is going to work but can't get past the screen due to a remote error message on the LG TV I can't seem to get the Xfinity remote to work. I am trying to have the Xfinity remote as my only remote and not use the LG. I could really use some advice in how to accomplish this task. Also, I am trying to bypass the internet as my download speed is horrible. I do not want the smart tv feature at this time until the internet equipment is updated. Thank you for any assistance you can provide.