- Step1: Prepare Fortigate OS which you want upgrading/dowdgrading (attent to choose the right version for your hardware). You can download Fortigate OS in http://support.fortinet.com.
- In Dashboard-> System information, choose update in firmware version.
- In firmware management, choose Upload firmware.
- There will be a notice about Dowdgrading and upgrading. You should backup the configuration before process.
- Choose confirm and continue process.
- System will reboot, it takes some minutes.
- Login firewall and check current version.
In
this post, I have upgraded my Fortigate 200D from version 5.2.9 upto 6.0.4.
Some configuration may be not work fine, You need to double check the
configuration.
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