Hi, I am doing a little project for my municipal PD (Non-Profit). their radios currently have MDC-1200 for their identifiers. In the actual physical codeplug Under "SIGNALING - No" Option #2 (MDC1200) is selected and available. How ever, when I ever go to the settings tab "signaling" - "MDC1200" is unselectable (Grayed out) to modify. I figured it was my Software being out of date and needed the newer software -so I purchased and downloaded the most up to date software, still unselectable. Do you know why this would be??? the radio is a mobile - Vertex Standard VX-4200 series Firmware: 1.77 - Software CE59 V 4.04. Like I said the radio already has an MDC1200 ID in it which they currently use. They requested me to update some channels for them and I need to do it on multiple radios and it would be a lot easier and less time consuming to have the codeplug pre-made for each unit apposed to reading each device and modifying the code on location.