Go to System > Dashboard > Status and click Backup .
I understand you're looking for information on downloading firmware for a FortiGate 100D, but I need to provide an important clarification before proceeding.
Once you've selected the firmware version you want to download, follow these steps: Fortigate 100d Firmware Download BEST
For the FortiGate 100D, you cannot upgrade to modern versions like 6.4, 7.0, or 7.2 due to hardware limitations. 6.2.15 .
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Go to System > Dashboard > Status and click Backup
Upgrading firewall firmware requires strict adherence to formal operational procedures to prevent configuration corruption. 1. Calculate the Upgrade Path
When a device is active (non-EOL), the "best" firmware is simply the latest general release. For the 100D, the logic changes. Here is what "BEST" means in the EOL context: If you share with third parties, their policies apply
If your device won’t boot or you cannot access the GUI, you can use the TFTP method for a "bare metal" recovery.
Because the FortiGate 100D is an aging platform operating on a legacy firmware branch, it faces growing operational limitations. FortiOS 6.2 no longer receives new feature updates, and signatures for modern threat matrices can strain older hardware resources.
If you are looking for the absolute best balance of security, stability, and features for the FortiGate 100D, the consensus among network administrators is .
Once you have downloaded the correct .out firmware file, use one of these two methods to install it. Method 1: Web GUI (Recommended for Normal Upgrades) Log into your FortiGate 100D GUI dashboard.