I recently purchased an Olevia 237 and yesterday tried
to get it to work with my Comcast remote. The remote they
gave me is labeled "Comcast Custom DVR 3" and takes 4
digit codes, but, after looking at the manual on the Comcast
remote page here:
[Link: comcast.com]

the Comcast Cutom DVR 3 actually takes 5 digit codes and
has a category for LCD TV's (new) and Olevia is on the
list. (Mine is actually the Comcast DVR 3, not the Custom)

I tried my local Comcast store and called customer service,
but no one seems to know about this remote nor how we
Olevia customers can get ahold of this remote. I notice
that Vizio and other mass market LCD TV's are on the new
list, so I am thinking that this remote will soon be available.
If anyone else finds anything else out, please share!

PS I have since found out that the way you tell the difference
between the remotes is that the newest one has a red select
button while the older one has a gray select button.