This can be checked in the release notes of the firmware (only available in English) - most, if not all firmware release notes contain a "Read Me First"-section, which contains some important notes regarding this firmware version: How do I know what firmware to apply before moving to the last firmware? To avoid issues leading to configuration loss, please read through and eventually proceed as explained within this article:Īvoiding configuration corruption & crashes on firmware upgrade/downgrade ("Setenv-Script").First, check if there is another firmware version necessary to apply before moving to that respective firmware. You should not directly install the latest firmware in case you have an older firmware version.Security Products - Firmware History Overview (FLEX, ATP, USG, VPN, ZYWALL) Older firmware versions than these can be found in this article:.The latest 3 firmware versions can be found at after logging yourself into your account and then navigating to the section called "Download Firmware".There are some basic things to consider here: Where can I find the release notes of my firmware?.How do I know what firmware to apply before moving to the last firmware?.It also shows you how to find out the proper firmware migration path of your unit.
This article mostly refers to older USG-series devices but will showcase a general approach to getting your firmware upgrade smoothly from an older version to the latest firmware version.
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