Here are the relevant links and documentation for upgrading your Firepower device from version 7.2.7 to 7.4.2.1:

1. Cisco Secure Firewall Threat Defense Release Notes for 7.4: This document contains information about the latest release, including new features, important notes, and guidance regarding the upgrade process. It can be crucial in understanding what to expect during the upgrade.

   • Cisco Secure Firewall Threat Defense Release Notes 7.4

2. Upgrade Path for Firepower Threat Defense: This resource outlines the specific upgrade paths for the Firepower Threat Defense (FTD). It's important to ensure that you are following the correct upgrade sequence as per Cisco guidelines.

   • Upgrade FTD – Firepower Management Center

3. Cisco Secure Firewall Threat Defense Compatibility Guide: This guide provides information about the hardware and software compatibility for Cisco Secure Firewall Threat Defense, which is essential to ensure that your current setup supports the upgrade.

   • Threat Defense Compatibility Guide

Additional Steps or Considerations

• Before initiating the upgrade, ensure that you have a complete backup of your current configuration and system state.
• Review the release notes and compatibility guides to confirm that all prerequisites are met for a smooth upgrade.
• Consult Cisco’s general upgrade practices and recommendations for Firepower devices before proceeding.

These resources should equip you with the necessary information and guidance for upgrading from version 7.2.7 to 7.4.2.1 of your Cisco Firepower devices. If you have any further questions or require additional assistance, feel free to ask!

Sources

Cisco Secure Firewall Threat Defense Release Notes ...Upgrade FTD [Cisco Secure Firewall Management Center]Cisco Secure Firewall Threat Defense Compatibility GuideCisco Secure Firewall Management Center Compatibility ...Cisco Secure Firewall Device Manager New Features by ...Cisco Secure Firewall Management CenterRelease Notes - Cisco Secure Firewall Management Center

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