How do I program my Comcast remote?

I accidentally did a factory reset on my Comcast remote (Comcast URC-106XXXXX Silver Remote)

My DVR box is a Cisco RNG200 DVR.

I suck with technology.

The remote…obviously is no longer working with the box. Is there any way I can get it back to default settings? Right now, none of the buttons do anything. I’ve tried a million codes but none work for DVR boxes?

Also, I am using a Sylvania TV. Don’t judge me if this is a dumb suggestion but could I somehow use my Sylvania remote for cable and everything? Sorry, I’m a lost cause with technology.