CHIRP

I have the UV-82HP. when I go into chirp and go to download from radio it pops up an error message that say "radio refused to send block" or it will say "radio not responding". this is the only program I can find that will even come close to programming this radio considering its new. I am in the fire service and i have field programmed the fire frequency in my radio so that does for now but I would like to figure out why this is doing this and try to fix it so i can program more frequiencies with alphanumeric names.