Ensure your radio is turned before connecting it to the computer.
Warning: Downloading software from unofficial sources always carries the risk of malware. In 2021, we saw a rise in fake "radio programming tools" that were actually data scrapers. The legitimate HYT software usually came as a RAR or ZIP file, often named something like HYT_TC700_Vx.x.x . hyt tc700 programming software 2021
After customizing your settings, click the icon or go to Program -> Write to Radio . Wait for the progress bar to finish. Ensure your radio is turned before connecting it