This occurs when your software is older than the radio’s firmware. Download the latest Kirisun DP405 programming software version (v2.10 or newer). Do not attempt to force-write an older codeplug – it can brick the radio.

The side keys can be assigned specific functions (short or long press), such as emergency alerts, scan toggles, or power level adjustments. 2. Technical Setup and Hardware Requirements

When you plug in the USB cable, check your computer's Device Manager. The cable should show up as a COM Port. If it shows an error, you likely need to install the USB-to-Serial driver typically provided with the cable. Back Up First: