: Once installation is complete, connect the OPC-1122U to a USB port on your powered-on radio.

The is not just a piece of software—it is the key to unlocking the full functionality of your Icom transceiver. While the initial setup can be frustrating due to chipset variations (Silicon Labs vs. Prolific) and Windows driver enforcement, understanding the underlying hardware IDs solves 99% of problems.

Modern versions of Windows (especially Windows 11 22H2 and later) enforce strict driver signing. If you attempt to install an old unsigned driver (circa 2015), Windows will block it.