Navigate to web.archive.org and search for firstcom.com . Look for support pages from 2010–2015. The FC-136 firmware was often named FC136_Vx.x.x.bin .
: Ensure the USB-to-Serial driver for your cable is correctly installed in the Windows Device Manager to ensure the software can "see" the radio. Key Specifications Frequency Range : VHF 136–174 MHz. Power Output : Typically 5 Watts. Capacity : 128 programmable channels.