Hot!Downgrade OS

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Tonatiuh
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2018/06/14 17:25:44 (permalink)
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Downgrade OS

FortiWiFi 60E - OS 5.4.1
 
How can I backup entire OS, or whatever be needed to upgrade to higher OS version, and be able to downgrade to my previous OS if I consider it is better/needed for me.
 
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    zhunissov4
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    Re: Downgrade OS 2018/06/14 19:46:59 (permalink)
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    Hello, 
     
    All you need it is to follow the Upgrading/Downgrading Path of FortiOS ( http://cookbook.fortinet.com/sysadmins-notebook/supported-upgrade-paths-fortios/) and have a valid support contract for the Fortinet devices. 
    Please, read the Release notes here before doing it - https://docs.fortinet.com/fortigate/admin-guides due to some FortiOS might not accept some configs from another FortiOS.  You can backup the configs on Main Dashboard of FortiGate.
     
    Hope it helps! 
     
     
     
    #2
    ede_pfau
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    Re: Downgrade OS 2018/06/15 03:59:30 (permalink)
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    If the current version added features or changed the syntax of some commands then a downgrade would most likely result in a loss of configuration.
     
    I would do the downgrade with the USB stick method: place the old config file and the old firmware image on a FAT32 USB stick (max. 4 GB), connect it to the FGT, and enable the automatic upgrade (System>Advanced>Auto-install). This way, as the versions on the stick have precedence, first the old firmware is installed and then the old config. Reboots automatically, several times.

    Ede

    " Kernel panic: Aiee, killing interrupt handler!"
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    Phil M
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    Re: Downgrade OS 2019/03/15 09:30:53 (permalink)
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    sorry to Hijack the thread.
     
    I am looking to downgrade the firmware on a 50E (long story) I'm not worried about keeping any configuration. So if I stick 5.6.2 on a USB and reboot the fortigate it will install that firmware? If i haven't got a config file do I need to disable "Detect Configuration" in system>advanced>auto-install or will it just ignore it if it doesn't find one?
     
    thanks
     
    Phil
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    rwpatterson
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    Re: Downgrade OS 2019/03/15 10:32:43 (permalink)
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    If you don't care about the pre-existing configuration, I would do a factory-reset, then downgrade away. If you get errors in the current version due to commands existing in the newer code, then factory reset once again.

    -Bob - self proclaimed posting junkie!
    See my Fortigate related scripts at: http://fortigate.camerabob.com

    -4.3.19-b0694
    FWF60B
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    #5
    ede_pfau
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    Re: Downgrade OS 2019/03/15 11:38:16 (permalink)
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    It will skip the 'restore config from USB stick' step if there isn't any. Just check that you run an 'exec factoryreset' from the command line (CLI) first. It will (amongst other things) activate the USB boot option. That's all.

    Ede

    " Kernel panic: Aiee, killing interrupt handler!"
    #6
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