If you are looking to download the latest or most stable firmware for your unit, here is everything you need to know. What is the "Best" Firmware for FortiGate 100D?
The "best" firmware for a FortiGate 100D is (or v6.0.14 if 6.0.15 is unavailable). This is the final stable build released for the platform. Do not attempt to install v6.2 or later; the 100D lacks the hardware specifications (specifically NAND flash and RAM) to run these versions, leading to boot loops or crashes. Fortigate 100d Firmware Download BEST
Official firmware downloads are only available through the Fortinet Support Portal . If you are looking to download the latest