I think I have seen a similar/same advert with mention of must have ending X. However there Webasto part# was for Golf/Passat. To me it seemed there was a mixup of the "X" - actually meaning the suffix can be anything (even empty) but the Webasto part# is the significant. I'm not aware that the suffix would define such a critical feature. I'm afraid that there even does not exist any Webasto that would have part number with suffix X.
I'd also like also to think that the remote is not issue. Steady green or red means it has established communication. You can verify that easily - just remove the fuse of the controller - you will get again flashing red/green.
Put the fuse back - wait 30 secs (just not to resync) before pressing a button. Steady again.