Dell Wyse ThinOS Version 8.6 Administrator’s Guide

Firmware signature

Firmware signature feature was introduced in ThinOS 8.3.1 for better firmware security. From ThinOS 8.4 release, firmware signature verification is added to enhance firmware security.

Salient features

• By default, signature verification is required on firmware downgrade/upgrade process.
• Provision to downgrade from 8.4 firmware to 8.3 firmware without signature. For example, earlier to ThinOS 8.3.1 release, the firmware downgrade is prohibited by default.
• New INI parameter verifysignature=no is introduced to enable user downgrade firmware. For example: autoload=101  verifysignature=no. For more information about using INI parameters, refer to the latest Dell Wyse ThinOS INI Reference guide.

  The following scenarios are allowed without need of using INI parameters:

  • Upgrade from 8.3.x firmware to 8.4 firmware.
  • Upgrade or Downgrade between 8.3.x and/or earlier firmware.
  • Upgrade or Downgrade between 8.4 and later firmware.