There have been a few with older MX Remotes that had touble registering on URC's Site. On the older MX Remotes there is a different serial number format that cannot be directly entered on URC's Site. I have posted the following for those that have a serial number in the format xxxx yyyyyy.

I believe that the x's denote the manufacture date and the y's denote the serial number. An example would be 0703 012345. When you input the serial number choose a letter in the drop down menu and enter your serial number twice (once in each blank). The above example would be entered as K 012345 012345. If this doesn't work try one of the other letter combos such as KR, KB12 or KB13 in the drop down menu or leave it blank.

Since this post is a sticky I thought it would be a good place to post this information.

Edited serial number (only six digits not seven digits as noted by dsinder in following post).