Before initiating the upgrade, verify compatibility and perform essential backups.
If you use a Firewall Management Center (FMC) , it must be upgraded to the target version (or higher) before you upgrade the managed 2110 devices. cisco firepower 2110 threat defense upgrade
Use the Cisco Secure Firewall Compatibility Guide to ensure your current FTD version can upgrade directly to your target version. Before initiating the upgrade
Always take a full backup of both the FMC and the FTD device before starting. cisco firepower 2110 threat defense upgrade
Get the upgrade package from the Cisco Software Central and upload it to the FMC under System > Updates .
Push the upgrade package to the 2110 device ahead of time to reduce the actual maintenance window duration.