ThinOS 9.1.3129 to ThinOS 9.1.4234 Image file for Dell Wyse 3040, 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 earlier versions of ThinOS 8.6, you must first upgrade to ThinOS 8.6_807 and apply the latest BIOS updates before upgrading to ThinOS 9.1.4234. If you are using ThinOS 9.0, or any version of ThinOS 9.1 that is older than 9.1.3129, you must first upgrade to ThinOS 9.1.3129 before upgrading to ThinOS 9.1.4234.
For more information, see the Dell Wyse ThinOS Version 9.1.4234 Migration Guide at www.dell.com/support.

- 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.

- You cannot boot into ThinOS 9.1.4234 when you perform any of the following operations in BIOS setup:
Disable the on-board Network Interface Card (NIC), Trusted Platform Module (TPM), or Platform Trust Technology (PTT).
Clear TPM or PTT.
Reset BIOS to factory default settings

- You cannot install ThinOS 9.0 application packages on ThinOS 9.1 due to certificate change.

For more information, see Important notes section in the latest Dell Wyse ThinOS 9.1.4234 Release Notes at www.dell.com/support.

This image is intended for customers who want to upgrade from ThinOS v9.1.3129 to ThinOS v9.1.4234.

Upgrade ThinOS firmware through Wyse Management Suite

Prerequisites
- If you are using ThinOS version 9.0, upgrade to ThinOS 9.1.3129.
- If you are using a ThinOS 9.1 version that is older than 9.1.3129, upgrade to ThinOS 9.1.3129.
- The thin client must be registered to Wyse Management Suite.
- Download the ThinOS 9.1.4234 (DTOS_9.1.4234.pkg) firmware to upgrade.
- Update the BIOS version of Wyse 5070 Thin Client to 1.3.1 or later before upgrading to ThinOS 9.1.4234. If you upgrade to
ThinOS 9.1.4234 with earlier BIOS version and then upgrade the BIOS version to 1.3.1 or later, the device may fail to boot. For latest BIOS versions, see Tested BIOS version for ThinOS 9.1.4234.
- Before you migrate from ThinOS 8.6_807 to ThinOS 9.1.4234 or upgrade from ThinOS 9.1.3129 to 9.1.4234, power on the system and disable the sleep mode. If the system has entered the sleep mode, you must send the WOL command through Wyse Management Suite before using any real-time commands. To use the WOL command, ensure that the Wake-On-LAN (WOL) option is enabled in BIOS.

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 9.1.4234 OS 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.

Important notes
- 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.
- You must install the Citrix Workspace app package first, and then install the Citrix-related application packages. Example:
HID, Cisco WebEx Meeting.

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