Avoid third-party driver sites. They often package malware or outdated unsigned drivers. The only safe source is the official Cisco Software Download portal.
A quick note on the search terms that likely brought you here: the general keyword combination asr9xxusbconsoledriverszip upd likely searches for an update to this driver. The second term, asr-9xx_usbconsole_drivers.zip , is the more precise and correct name of the file. We'll be using the correct filename throughout this guide.
Once installed, the device should appear as a in the Device Manager. Troubleshooting ASR 9xx USB Console Issues asr9xxusbconsoledriverszip upd
Plug the cable into the port clearly labeled "USB Console" on the front or side of the ASR unit. Do not confuse this with the standard USB storage port. 4. Install the Driver Open Device Manager on your Windows PC.
| Failure Scenario | Root Cause | How asr9xxusbconsoledriverszip upd Resolves | | :--- | :--- | :--- | | | Driver signing expiration (old SHA-1 certs). | upd includes SHA-256 signed drivers. | | Linux: "ftdi_sio: Unknown symbol" | Kernel module conflict. | upd script blacklists conflicting modules. | | macOS: "System Extension Blocked" | Legacy kext not approved. | upd uses Apple-approved DEXT framework. | | Intermittent disconnects during reload | Buffer overflow in old driver. | upd increases internal FIFO buffer from 256B to 4KB. | Avoid third-party driver sites
Windows Device Manager will show an "Unknown Device" or "USB UART" under other devices.
If you are looking for the update, you are likely trying to establish a terminal session with a Cisco ASR 900 Series router (like the ASR 901, 903, or 920) via the mini-USB console port. A quick note on the search terms that
Sometimes the driver installs, but PuTTY is configured to use the wrong COM port number. Check Device Manager to find the correct number and update your terminal emulator settings accordingly.
Use a tool like WinRAR or the built‑in Windows extraction utility to unzip asr-9xx_usbconsole_drivers.zip to a convenient location on your computer.
Modern Linux kernels include the CDC-ACM driver, but the ASR9xx uses a non-standard USB vendor ID. The update package contains a udev rule.
If you have an older version of the Cisco USB driver installed: Open . Look under Ports (COM & LPT) .
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