Upgrade the Device using TFTP - Configuration Guides - Cisco

For CFE (Broadcom-based routers):

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Expected output: Firmware version: 1255 or 12.55 .

⭐⭐⭐⭐ (4/5) – Reliable if done correctly, but outdated protocol has risks.

(no authentication, no encryption). Therefore:

Connect to the target device using a console cable (RS-232/USB-to-Serial) and a terminal emulator (e.g., PuTTY, minicom). Baud rate is typically set to 9600 or 115200.

To upgrade your firmware to version 1.255 via TFTP, follow the general procedure for preparing a TFTP server and executing the transfer to your device. 1. Prepare the TFTP Server Download Firmware : Obtain the version 1.255 file from the manufacturer's official support site. Setup TFTP Software : Use a utility like TFTPD32/64 Windows built-in TFTP client Root Directory : Place the firmware file (e.g., ) into the TFTP server's root folder. Network Config