Free CCNA Bangla 2025 | Day -64 | How to Upgrade Cisco IOS via TFTP | Step-by-Step on Real Hardware

Is it time to update the firmware on your Cisco gear? Upgrading the IOS is an essential skill for any network engineer, but it can be intimidating on physical equipment.
In this video, I take you through a complete, hands-on walkthrough of upgrading a real Cisco device (Switch/Router) using the industry-standard TFTP method. We move beyond simulators and show you exactly how it looks in a real-world lab environment.
📘 What we cover in this tutorial:
• Prerequisites: What you need before starting (IOS Image, TFTP Server software, Console connection).
• Setting up your laptop as a TFTP server.
• Establishing connectivity between the Cisco device and your TFTP server.
• The critical commands: dir flash:, ping, and the all-important copy tftp: flash:.
• Verifying the MD5 hash to ensure a non-corrupted image.
• Setting the boot system variable and reloading.
• Verifying the successful upgrade.
⚠️ Disclaimer: Always ensure you have a backup of your current configuration and IOS before attempting an upgrade on production equipment.
⏱️ Timestamps: 0:00 Introduction 1:15 Prerequisites & Setup 3:30 Connectivity Check 5:45 The Copy TFTP Flash Command 8:20 Boot System Configuration 10:00 Verifying the Upgrade
Here are the tools I used in this video: [Link to TFTPD64 or SolarWinds TFTP] [Link to Console Cable you use]
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