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Dell ThinOS 2402 and 2405 Administrator’s Guide

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Downgrading the ThinOS firmware

If you are downgrading to ThinOS 8.6, ThinOS 9.0, or ThinOS 9.1 versions that are older than 9.1.3129, you must use the Dell Wyse USB Imaging Tool to install the ThinOS 8.x or 9.x Merlin image that is posted to Support | Dell. Before you downgrade, ensure that you disable the secure boot option in the BIOS. If you want to downgrade to ThinOS 9.0, you must clear Trusted Platform Module (TPM) or Platform Trust Technology (PTT) in the BIOS too. Else, ThinOS resets to factory settings after each reboot. If you are running the latest version of ThinOS, you can downgrade to ThinOS 9.1.3129 or later versions using Wyse Management Suite.


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