HowTo: Dell Wyse ThinOS Downgrade from 9.0 to 8.6

If you have performed your first Dell Wyse ThinOS 9.0 tests by now, you might want to downgrade those devices back to 8.6 again. In this guide I’m showing you how.

Dell Wyse USB Imaging Tool

For this test, I initially upgraded a Dell Wyse 3040 ThinClient with ThinOS to 9.0 with the Dell Wyse Management Suite 3.0. After my tests were finished, I wanted to use 8.6 on this device again, as I use it mainly to reconstruct customer issues, and most customers still use 8.6.

Go to http://downloads.dell.com/wyse/USBFT/ and download the latest Version of the Dell Wyse USB Imaging Tool, which is as of today version 3.3.0. You should also consider downloading and reading the User’s Guide.
Install the app on your Windows PC.

Next, you have to download the proper Merlin Image for your device not the raw image, in our case a Dell Wyse 3040: https://www.dell.com/support/home/de-de/product-support/product/wyse-3040-thin-client/drivers
OS_Merlin_v8.6_B013_3040_ENG.zip

Dell Wyse 3040 Firmware Download Page
Dell Wyse 3040 Firmware Download Page

Extract the ZIP files until you reach the .RSP file:

WTOS_3040_8192_0.rsp
WTOS_3040_8192_0.rsp

Now prepare a 2GB+ USB flash drive and format it with FAT32.

Next, start the USB Imaging Tool with Admin permissions. Select the correct USB-Drive and select Image Push mode in 64 bit. Press the + button at the bottom and select the WTOS_3040_8192_0.rsp file. Confirm your configuration and let the tool create the USB drive.

Dell Wyse USB Imaging Tool
Dell Wyse USB Imaging Tool

After the USB drive is created, eject it from Windows and plug it into your Dell Wyse 3040 with ThinOS 9.0.

Warning: Don’t use the blue front UBS 3.0 port, that didn’t work for me. Only the two back ports worked for me.

Start up the device and press F12 until you the pre-boot selection menu appears. Select the Device:
UEFI “YOUR USB STICK NAME/VENDOR”.

Boot selection menu
Boot selection menu

Hint: If the USB device does not appear in the boot menu, you may want to enter the BIOS settings and reset it to factory defaults.
The default BIOS password for Dell Wyse devices is: Fireport
Source: https://www.dell.com/support/article/de-de/sln290687/dell-wyse-hardware-what-are-the-bios-passwords?lang=en

You’ll now boot up the imaging menu and select the prepared 8.6_013 image, which will downgrade ThinOS from 9.0 to 8.6:

Dell Wyse USB Imaging Tool
Dell Wyse USB Imaging Tool

Press OK to start the process:

Start Image Pushing
Start Image Pushing

Wait until it’s finished:

Image Pushing
Image Pushing

After the process finished successful, remove the USB drive and press the restart button:

Successful Imaging
Successful Imaging

The setup will continue, finish and leave you with a Dell Wyse 3040 ThinOS version 8.6_013:

Setup ThinOS 8.6
Setup ThinOS 8.6

That’s it, feel free to ask questions and leave comments below, thank you!

Ps.: This method might also be useful, if you ever encounter a bricked device.

Author: Marco

Marco is an IT-System administrator and IT-Consultant with 10+ years experience. He is specialized in the delivery of virtual Apps and Desktops with Citrix solutions. In 2017 he has been awarded Citrix Technology Advocate by Citrix for his community work (#CTA). His second core area is availability & performance monitoring with Zabbix, a leading open-source solution. His employer is the German IT-Company ANAXCO, which is developing a Transport Management Software (TMS) based on Microsoft Dynamics AX. More about Marco

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