Understood, I will try to inform you when the additional documentation and improvements are available. Also keep an eye out for any changes from us regarding this topic.
Just to clarify, and make sure I understand your use-case.
Do you want to perform an OTA update from a Torizon 6.X image with tdx-signed to a Torizon 7.X image with torizon-signed? If not, what is your exact use-case?
If I can understand your use-case I can try to ensure our upcoming documentation will cover this.
Best Regards,
Jeremias