ThinOS 8.6 to ThinOS 9.1.3129 Base Image file for Dell Wyse 5070, 5470 and 5470 All-in-One Thin Clients

- Do not power off your thin client until the installation is complete.
- If you are using ThinOS 8.6, you must upgrade to ThinOS 8.6_807 and apply latest BIOS updates before upgrading to ThinOS 9.1 3129.
- If you are using ThinOS v8.5 or earlier versions, you must first upgrade your device to ThinOS 8.6_807 and apply latest BIOS updates before installing ThinOS 9.1.
- If you want to downgrade to ThinOS 8.6 or 9.0 or you want to downgrade from ThinOS 9.1.3129 to the previous ThinOS 9.1 versions, disable the secure boot option in the BIOS setup. Downgrading from ThinOS 9.1 to previous ThinOS versions using Wyse Management Suite is not supported. You can downgrade from ThinOS 9.1.3129 to ThinOS 8.6, 9.0 or ThinOS 9.1 previous versions by using the USB Imaging Tool and Merlin Images posted on the www.dell.com/support site.
- If you want to downgrade to ThinOS 9.0, you must clear TPM or PTT in the BIOS and then use the USB imaging tool and Merlin images to downgrade.
- You cannot downgrade from ThinOS 9.1.3129 to ThinOS 8.6, 9.0, or 9.1 previous version using Wyse Management Suite.
- You cannot downgrade to ThinOS 8.6_606 or previous versions, if you are running the systems with SSD devices.
- You must install the application packages after you downgrade from ThinOS 9.1 to ThinOS 8.6 using Merlin Image.

For more information, see Important notes section in the latest Dell Wyse ThinOS 9.1 Release Notes at www.dell.com/support.

Installing the ThinOS firmware using Wyse Management Suite:

Prerequisites
- Upgrade the thin client to ThinOS 8.6_807 with the latest available BIOS version. For the latest BIOS version, see Introduction. For more information about how to upgrade BIOS on your ThinOS 8.6 client, see the Dell Wyse ThinOS Version 8.6 Administrator's Guide at www.dell.com/support.
- The ThinOS conversion image must be added to the ThinOS firmware repository. For more information, see Add ThinOS firmware to the repository.
- Create a group in Wyse Management Suite with a group token.
- The thin client must be registered to Wyse Management Suite.

Steps
1. Go to the Groups & Configs page, and select a group.
2. From the Edit Policies drop-down menu, click ThinOS.
The Select ThinOS Configuration Mode window is displayed.
3. Select Advanced Configuration Mode.
4. Go to Firmware Upgrade, and click Configure this item.
5. Clear the Disable Live Upgrade if you want to upgrade immediately and clear the Verify Signature check box as well.
6. From the Platform Type drop-down list, select the platform.
7. From the Firmware to auto-deploy drop-down list, select the firmware added to the repository.
8. Click Save & Publish.
The firmware is deployed to the thin client. The conversion process takes around 10 minutes, and the thin client restarts automatically. After the upgrade is complete, the device is automatically registered to Wyse Management Suite.

Important notes
1. All device settings are erased after you upgrade from ThinOS 8.6 to 9.1.3129 except the following settings:
- Wyse Management Suite group token and server settings
- Static DNS
- Certificates
- IEEE802.1x wired authentication settings
- Wireless connections
The WEP/Sharekey security type is changed to Open as they are not supported in ThinOS 9.1.
- Proxy settings
2. You must back up your device settings before you start the upgrade process to ThinOS 9.x. Once upgraded to ThinOS 9.1, you can downgrade to ThinOS 8.6 only by using the Merlin image.

For more information about the firmware upgrade process, see the Dell Wyse ThinOS 9.1 Migration Guide at www.dell.com/support.