The software is a commercial product rather than a free firmware download. You can find it through official dealers or specialized third-party programming solutions: ICOM IC-2820 Clone & Programme Software
Read from and write to the radio to backup your current setup or clone configurations between multiple IC-2820 units. Icom Cs-2820 Software Download
The Icom CS-2820 is the official programming and cloning software designed for the Icom IC-2820/IC-2820H dual-band mobile transceiver. It provides a fast and reliable way to manage memory channels and configure device settings from a Windows PC. The software is a commercial product rather than
Adjust frequency, offsets, step sizes, tone/DCS settings, and power levels. and power levels.