As a Motorola/Kenwood guy, I thought I would dip my toe in the water on the EFJ equipment. I purchased (on eBay) a 5100, model 242-5117-660. Does anyone know what version of software I need? It appears that unlike Motorola and Kenwood, the software version is directly related to the model number? (Now that's a different concept for me! LOL) Once armed with that info, I can search out the appropriate software. Thanks in advance for any "newbie" help that is provided!