Dell Wyse ThinOS Version 9.1.4097, 9.1.4234, 9.1.5067, and 9.1.6108 Operating System Release Notes

If you are downgrading ThinOS 9.1.4234 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 www.dell.com/support. Before you downgrade, ensure that you disable the secure boot option. If you want to downgrade to ThinOS 9.0, you must also clear Trusted Platform Module (TPM) or Platform Trust Technology (PTT) in BIOS. Else, ThinOS resets to factory settings after each reboot. You can downgrade from ThinOS 9.1.4234 to ThinOS 9.1.3129 using Wyse Management Suite.