A specialized USB programming cable (specific to the P8600/P8668 series) is required to connect the radio to your PC. Driver Installation:
Fix: Check your cable connections. Open Windows Device Manager and verify that the Motorola Radio appears under Network Adapters or Ports without an error exclamation mark. Reinstall the drivers if necessary. Motorola Xir P8668 Programming Software Download
To program the Motorola XiR P8668 , you need the MOTOTRBO Customer Programming Software (CPS) A specialized USB programming cable (specific to the