Technical Note: How to identify and restore previous version of firmware

[rameshk_FTNT]

Description

This article provides a method to identify and, if necessary, to restore previous firmware image from a flash disk (downgrade to previous version).

The relevant Release Notes and Admin Guides should be consulted prior to any change of firmware version in order to understand the implications of the change.

Scope

Identify previous firmware version.
Restore previous firmware version.

Solution

The following example illustrates how to restore the firmware from v5.2.2 to v5.0.9.

1) Determine the Image revision ID on flash using the command:

diag system flash list

FGT1KC3XXXXXXX # diag sys flash list
Partition  Image                             TotalSize(KB)  Used(KB)  Use%  Active
1          FGT1KC-5.00-FW-build292-140801    257967         34895     14%   No
2          FGT1KC-5.02-FW-build642-141118    257967         38946     15%   Yes

2) Use the following command to restore the firmware held in partition 1:

execute restore image flash 1

This operation will replace the current firmware version!
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