Dell Wyse ThinOS – “Invalid Digital Signature” Message

Issue: When attempting to downgrade ThinOS firmware from version 8.4.x to earlier versions, i.e. 8.3.x, 8.2.x, etc.. you may get the following message, “Invalid Digital Signature”.

Resolution: In order to rollback the version of firmware you need to add the following parameter to your wnos.ini configuration file or WMS/CCM configuration.

VerifySignature=no

Note: This will need to be added on a line starting with, “autoload=x”

For example: autoload=1 VerifySignature=no

See v8.4 INI guide for further details here.

More details on VerifySignature= parameter from the 8.4 release notes:

“The option VerifySignature specifies to verify the signature or not when updating the firmware and/or packages. It is introduced in 8.4 and later to make sure the security and integrity of the firmware and packages. If set VerifySignature to no, it will not check the signature so that to downgrade the firmware and/or packages which did not support signature. The default is yes.”

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