ThinOS 2508 (9.6.3071) Recovery Image File

- Do not power off your thin client until the installation is complete.
- You cannot boot into ThinOS 2508 (9.6.3071) or later versions when you perform the following operations:
1. Disable the onboard Network Interface Card (NIC), Trusted Platform Module (TPM), or Platform Trust Technology (PTT).
2. Clear TPM or PTT.
3. Reset BIOS to factory default settings.
- From ThinOS 2408, ThinOS is updated to completely follow WMS Security Policy > TLS Security Level (default = 1). If your network environment requires a legacy OpenSSL version, then you must change the TLS security level to 0, when updating to 2508. Otherwise, the device can lose its network.

For more information about the updates, see the Dell ThinOS 9.x 2505 and 2508 Release Notes at www.dell.com/support.

Install ThinOS from USB drive using Dell OS Recovery Tool

Prerequisites
- Ensure that TPM or PTT is set to ON in BIOS.
- If you install the Windows operating system on the device, clear TPM or PTT before installing ThinOS.

Steps
1. Download Dell OS Recovery Tool at https://www.dell.com/support/home/en-us/drivers/osiso/recoverytool
2. Run the .exe file on the system to be used to create the USB drive.
The Dell OS Recovery Tool Application installer opens.
3. Click INSTALL.
4. After the installation is complete, open Dell OS Recovery Tool.
5. Select SWITCH TO ADVANCED RECOVERY displayed at the bottom of the tool.
6. In Select an OS image, browse to the ISO file that you downloaded and click NEXT.
7. Select the USB drive that you want to format from the USB drive dropdown.
NOTE: Some special USB drives do not support ThinOS ISO image by default. You can change the Partition Style and burn the operating system again.
8. Check the I understand that the selected drive will be reformatted and existing data will be deleted box.
9. Click BURN OS.
10. Remove the USB drive and connect it to the system that is powered off, on which you plan to install ThinOS. After connecting the USB drive, turn on the system.
NOTE: After the USB drive is removed, Dell OS Recovery Tool goes back to the screen that is displayed in Step 5.
11. Press F12 at boot up until you see the Dell logo and Preparing one-time boot menu... displayed at the top right corner. The boot menu opens.
12. In the boot menu, select the USB drive from the UEFI Boot Devices list.
NOTE: If you are unable to select the USB drive, ensure that Enable USB Boot Support option is enabled in BIOS.
13. Enter the BIOS password if prompted. The default password for most Dell thin clients is Fireport.
14. The thin client boots and a warning message with a 60-second countdown window is displayed.
Wait for 60 seconds or click OK to install the ThinOS image and application packages. The thin client reboots automatically.
Click Manually to display the ThinOS image and application packages list. Select the ThinOS image and the application packages that you want to install and click OK to install these files. The thin client reboots automatically.
NOTE: If your device is Dell Wyse 5470 and 5470 All-In-One Thin Clients, ensure to click Manually, select only ThinOS image, storage and click OK to install. Or installation will be failed due to storage space is not enough.
15. The system continues imaging and reboots automatically once complete.
For more information about how to Install ThinOS from USB drive using Dell OS Recovery Tool, see the Dell ThinOS Installation and ThinOS Activation License User Guide at www.dell.com/support.