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Would you like a sample PowerShell script to automate certificate import for multiple test machines?
bcdedit /set testsigning on Then the PC. You'll see "Test Mode" in the bottom-right corner. Note: This weakens security, so disable it after development with bcdedit /set testsigning off . 3. Expired Certificate Certificates used for driver signing have a validity period. If the certificate expired, Windows will reject it with error 15613.
# Import the test certificate to Trusted Root and Trusted People $cert = Import-Certificate -FilePath "C:\path\to\your\Driver.cer" -CertStoreLocation Cert:\LocalMachine\Root Import-Certificate -FilePath "C:\path\to\your\Driver.cer" -CertStoreLocation Cert:\LocalMachine\TrustedPublisher Restart-Service -Name DeviceInstall