Supported upgrade path information is available on the Fortinet Customer Service & Support site.
To view supported upgrade path information:
- Go to https://support.fortinet.com.
- From the Download menu, select Firmware Images.
- Check that Select Product is FortiGate.
- Click the Upgrade Path tab and select the following:
- Current Product
- Current FortiOS Version
- Upgrade To FortiOS Version
- Click Go.