Try take out the batteries and put them in again and try this.
Press “Settings” (at the left of S.INFO) and “Recall” (at the left of “0”) at the same time. Remote will switch to the next code page (totally 3 code pages). Point the remote to the mediacenter, press “S.INFO” button and hold it for 10 seconds. Mediacenter will display a message about changed code page.
have you tried to open, it if the main board is sticky, then try to wash it withsoap and water make sure its dry before you insert battery again. done this often when my remote not working
Does it blink when you press on any button?
It's probably broken
have you try to remove and bluetooth and turn on again
Rubbing alcohol
Can buy this remote on Amazon. Not worth any extra time than that.