I am trying to get the preloaded Pittsburgh system on my scanner and uniden says "To turn a preloaded system on or off, press SCAN, then press ./no then the two-digit System Quick Key." I have tried that and it does nothing. I do have preprogrammed counties in my scanner as well and am worried that using the preloaded system function will delete what I have in there now. So I guess my questions are as follows: Why can I not get the preloaded system function to work and if I do will it delete anything I have now? Thanks in advance for the help.