ThinOS 9.1.3129 or later to ThinOS 2205 (9.3.1129) Image file for Dell Wyse 3040, 5070, 5470 and 5470 All-in-One Thin Clients, and OptiPlex 3000 Thin Client

- Do not power off your thin client until the installation is complete.

- If you are using ThinOS 8.6 or earlier versions of ThinOS 9.x, you must first upgrade to ThinOS 9.1.3129 or later versions before upgrading to ThinOS 2205.

- On thin clients with ThinOS 9.x versions earlier than ThinOS 9.1.6108, upgrade the OS image first and then upgrade the BIOS after the OS image is successfully upgraded. Do not upgrade the BIOS and the OS image together. If you upgrade the BIOS and the OS image together, the BIOS upgrade is ignored, and you cannot upgrade the BIOS to the ignored version anymore. You must upgrade the BIOS to another version.

- After upgrading to ThinOS 2205, all old application packages are removed automatically. The old application packages can be downloaded, but installation fails the first time. After this, the old application packages cannot be downloaded anymore. You must install the latest application packages.

- If you want to downgrade ThinOS to a version earlier than 9.1.3129, you must use ThinOS Merlin image.

- You cannot boot into ThinOS 2205 (9.3.1129) or later versions when you perform the following operations:
Disable the onboard Network Interface Card (NIC), Trusted Platform Module (TPM), or Platform Trust Technology (PTT).
Clear TPM or PTT.
Reset BIOS to factory default settings.

- The upgrade may fail if the event log fails to install. In such an event, you may reboot the device and upgrade again.

ThinOS Limitations on Latitude 3420
- The integrated microphone is not supported.
- Dell WD19 docking station and Dell DA310 USB-C Mobile Adapter are not supported.
- 4K 60 Hz display resolution is not supported. Monitors with default resolution 4K 60 Hz downgrades to 30 Hz, 24 Hz, or lower resolution.
- Type-C port display audio is not supported.
- Sleep mode is not supported.

For more information about the updates, see the Dell Wyse ThinOS Version 2205 Release Notes at www.dell.com/support.

Upgrade ThinOS firmware through Wyse Management Suite:

Prerequisites
- Ensure that you are running ThinOS 9.1.3129 or later version on your thin client.
- Create a group in Wyse Management Suite with a group token.
- The thin client must be registered to Wyse Management Suite.
- Download the ThinOS 2205 (9.3.1129) firmware to upgrade.

Steps
1. Go to the Groups & Configs page and select a group.
2. From the Edit Policies drop-down menu, click ThinOS 9.x. The Configuration Control | ThinOS window is displayed.
3. In the left pane, click Standard.
4. From the Standard menu, expand Firmware, and click OS Firmware Updates.
NOTE: If you cannot locate the OS Firmware Updates option under the Standard tab, use the Advanced tab.
5. Click Browse and select the ThinOS 2205 firmware to upload.
6. From the Select the ThinOS Firmware to deploy drop-down menu, select the uploaded firmware.
7. Click Save & Publish.
The thin client downloads the firmware to install and restarts. The firmware version is upgraded.
NOTE: There are chances that the upgrade might fail with event log stating Failed to install. In such an event, you may reboot the device and upgrade again.
NOTE: After upgrading to ThinOS 2205, all old application packages are removed automatically. You must install the latest application packages.

For more information about how to install the ThinOS 2205 (9.3.1129) image, see the Dell Wyse ThinOS Version 2205 Migration Guide at www.dell.com/support.