Created on 05-23-2024 11:09 PM Edited on 09-23-2024 11:55 PM By Jean-Philippe_P
Description | This article describes how to recover the previous firmware and config using the console after the FortiOS upgrade. |
Scope | FortiGate. |
Solution |
Scenario: In some cases after an upgrade, the device is unable to boot or unable to login. This may be due to following the incorrect path or a corrupted firmware image file.
As the admin user is unable to log in to the device, the possible option are:
Note: In some scenarios, PuTTY becomes unresponsive after a reboot. Downloading the Tera Term terminal emulator tool is recommended, as it does not encounter the same issue and allows for key presses to display the configuration menu easily. Tera Term can be downloaded from this GitHub link https://github.com/TeraTermProject/teraterm/releases/tag/v4.108. The recommended TeraTerm version is 4.108, as TeraTerm version 5.x is incompatible with the TAC script.
[B]: Boot with backup firmware and set as default.
The FortiGate will boot on the previous working firmware version. With the 'diagnose sys flash list' command, it is possible to verify the backup and the current working firmware.
Related article: Technical Tip: Selecting an alternate firmware for the next reboot |
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