Did you try other batteries and not just the ones included? If you get universal remote and it doesn't list Roku tv codes, try tv codes under Admiral, Dynex, Insignia, and TCL. Roku tv's don't respond to plain Roku codes in universal remotes.
I tried different batteries it still didn't work. I brought a universal remote for it but the up amd down button moves the cursor left amd right. The left and right button dosen't work at all even with trying different codes for it so I can't even put in the password to connect to my wifi. I contacted roku amd there response was only a logitech harmony universal remote will work as far as universal remotes go. I checked Amazon for amd the they are $69 up to almost $300 which I'm definitely not going to spend on a remote