Technical Tip: How to cancel FortiGate upgrade using Fabric management page (Fabric upgrade)

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Description	This article describes that a FortiGate upgrade using Fabric Management can get stuck, which results in the Fabric Management page continuously loading. Buttons and options are not working on the GUI.  Error: 'configuration errors encountered during the upgrade'. It is not possible to cancel the fabric upgrade from the GUI as well.
Scope	FortiGate.
Solution	Cancel the ongoing Fabric upgrade. To cancel the upgrade, use the CLI command below: execute federated-upgrade cancel This will cancel the upgrade. If the upgrade is immediate or scheduled to happen very soon, some nodes may have already gone down for an upgrade. Do you want to continue? (y/n) More options for these commands are below: execute federated-upgrade cancel     <----- Cancel the currently configured upgrade. initialize    <----- Set up a federated upgrade. quick-fortigate-upgrade     <----- Set up a 15-minute immediate mode upgrade for all FortiGates in the CSF tree. quick-full-upgrade  <----- Set up a 15-minute immediate mode upgrade for all CSF devices. restart    <----- Restart the currently configured federated upgrade. status     <----- Show the current status of the federated upgrade. More details about Fabric Upgrade on: Upgrading all device firmware by following the upgrade path (federated update) Note:  Starting with v7.4.8 and v7.6.4, a new behavior has been introduced on unlicensed or end-of-support FortiGate devices. See this document: Automatic firmware upgrades for FortiGate appliances with invalid support contracts or that have rea.... For example, if the device has an expired support contract or is running EOL firmware, it may be forced to upgrade to the latest patch version. This upgrade cannot be cancelled; it can only be postponed for 7 days, and this can be done unlimited. execute auto-upgrade delay-installation For example, if the FortiGate has an expired support contract and is running v7.6.4, but the latest FortiOS from branch v7.6 is v7.6.8, the FortiOS will follow the recommended upgrade path. Additional note on automatic upgrades and cancel errors (v7.4.8+): In some cases, upgrading to FortiOS v7.4.8 (or later) before registering a valid support contract may incorrectly flag the device as unlicensed, triggering a forced auto-upgrade. When attempting to cancel the upgrade using: execute federated-upgrade cancel The following error may be displayed: The existing upgrade cannot be changed.object check operator error, -39, discard the setting. Or: execute federated-upgrade cancel The existing upgrades cannot be cancelled. Command fail. Return code 1 As a workaround, it is possible to boot the device using the secondary firmware image running a version before v7.4.8: Technical Tip: Selecting an alternate firmware for the next reboot. After booting into the alternate image, the Upgrade button in the GUI should become available again instead of remaining grayed out. Related articles:  Technical Tip: How to confirm an upgrade was done by federated-upgrade feature - Fortinet Community Troubleshooting Tip: Fabric management loading forever after trying to upgrade Technical Tip: Firmware upgrade for FortiOS firmware 7.2 and later via the upgrade path (federated u... Technical Tip: Disable auto-upgrade for unlicensed FortiGates