@Steve Chang
Hi,
This Cross Certificate will expire on April 2021 and Microsoft will not be issuing trusted Cross Certificates for this purpose anymore.
You will need to follow the new Kernel Mode driver signing process which requires an EV Code Signing Certificate. OV/ Standard Code Signing using the Cross Certificate will no longer be applicable.
Registration for the Microsoft Hardware Program is required, this can be done in the Microsoft Hardware Dev Center. This way you can register your EV Certificate for further use in signing Kernel Mode driver packages.
Driver packages signed with the registered EV Certificate can then be submitted using signtool.exe.
Hope above information can help you.
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.