Never skip this step. Go to the dashboard, click , and save the system configuration file locally to your management PC. 2. Perform the Upgrade Via Web UI Navigate to System > Firmware .
Because the FortiGate 100D is at the end of its life, the ultimate "best practice" is to plan a migration to modern FortiGate hardware that supports FortiOS 7.x and beyond. Legacy Model Recommended Replacement Key Advantages FortiGate 80F / 90F Massive throughput jump, lower power, desktop/rack options. FortiGate 100D FortiGate 100F
🛑 Critical Alert: The Final Firmware Cap for FortiGate 100D
Scroll through the alphabetical list of hardware models until you find the specific file for the FortiGate 100D. Fortigate 100d Firmware Download BEST
: To download firmware images directly, you must have an active or legacy device registered under a valid FortiCare Support Contract account.
Navigate to the portal (fortinet.com). Log in with your registered credentials. Go to Support > Firmware Download .
What is your FortiGate 100D running right now? Never skip this step
The Ultimate FortiGate 100D Firmware Download Guide: Best Practices & Methods
“For a homelab, it's good. For a gov business... nope, because we can't keep an active subscription license with it.” Reddit · r/homelab · 2 years ago Maintenance & Security Risks What is stable and recommended version for Fortigate 100D
You cannot simply jump from a very old version (like FortiOS 5.4) straight to FortiOS 6.2. Doing so will corrupt your configuration file, causing policies, VPN configurations, and routing tables to break. 1. Use the Fortinet Upgrade Path Tool Perform the Upgrade Via Web UI Navigate to System > Firmware
Report generated based on Fortinet public EOL policies and technical release notes. Last updated: 2025.
Finding the "BEST" firmware for your FortiGate 100D means understanding that its best days are behind it. The goal is to secure your legacy device with the most stable final firmware release.
Never download FortiOS images from unofficial forums or "free" mirrors. These files can be injected with backdoors that compromise your entire network. Choosing the Best Firmware Version
Before uploading any firmware, log into the Fortinet Support Portal and use the (found under the Support menu). Input your current firmware version and your target firmware version. The tool will generate a precise sequence of intermediate versions you must install sequentially. 2. Always Back Up Your Configuration
Once logged in, click on the Support menu at the top and select Firmware Download .