Do not download v5.6. The "BEST" firmware for the FortiGate 100D is FortiOS 5.4.13 (build 1180).
Perform these updates during a maintenance window to avoid disrupting users if a rollback is required. Fortigate 100d Firmware Download BEST
The reached its End of Support (EOS) on July 26, 2023 . Consequently, it does not support the latest FortiOS versions (v7.0 and above); the final compatible firmware version for this model is FortiOS 6.2.15 . Best Stable Firmware For the FortiGate 100D, the recommended stable path is: Do not download v5
: The 100D cannot be upgraded to FortiOS 6.4, 7.0, or higher due to technical hardware constraints (specifically related to the NP6Lite processor). 2. Official Download Method The reached its End of Support (EOS) on July 26, 2023
⚠️ Never download firmware from third-party sites. These unofficial files often contain malware or backdoors that can compromise your network. 📥 Official Download Process
: Review the Release Notes on the Fortinet Document Library for known issues specific to the 100D. If you'd like to proceed, let me know: What is your current firmware version ? Do you have an active FortiCare support contract ? Are you upgrading a standalone unit or an HA cluster ? Upgrading individual devices | FortiGate / FortiOS 7.6.6