updating your MR can be done several ways. the most popular and most cost-friendly is to it via pcmcia port on a laptop and use ucas1.3 for updating the mr files. another is to use funcards to update the MR, then next is to purchase a cas2 interface from duolabs.com and use that to reprogram your MR. (further info can be found for updating the cams from http://www.matrixcam.com/matrixreloaded.htm
You can edit the keys on the MR manually though if you wish to, it's using the DEC format so you have to enter it accordingly. most of the updated keys posted under the keys section has a corresponding MR keys value. good luck.