Keep it. Mirror it. One day, someone will need to recover a router that controls a subway system, and your copy of cisco-usbconsole-driver-3-1.zip will be the only thing standing between them and a train derailment.
If you have the original ZIP with the and the README.txt dated 2014-03-17 containing the line "Fixed: Blue screen when unplugging cable during Windows shutdown" — that’s a piece of engineering folklore. That bug cost someone at Cisco three months of their life. A Hidden Easter Egg In v3.1’s silabenm.sys , there’s a debug string left over from development: "CiscoConsole: Waiting for DTR to settle (legacy baud hack)" usb console software 3.1 - cisco-usbconsole-driver-3-1.zip
Cisco rushed — signed, WHQL-certified, with a new co-installer that cleaned old registry keys. But the real secret: v3.1 also fixed a hardware-level timing bug on certain 3800 ISRs where the USB chip would enter suspend mode and never wake up unless you power-cycled the router. Keep it
Cisco thought: Why force engineers to carry an extra dongle? They embedded a USB-to-serial chip directly on the motherboard. The promise: one mini-USB cable, no adapter. Brilliant. If you have the original ZIP with the and the README
That’s the deep story.